hpfs: You really don't want any checks? You are crazy...
hpfs: hpfs_map_sector(): read error
hpfs: code page support is disabled
==================================================================
BUG: KASAN: use-after-free in strcmp+0xa7/0xb0 lib/string.c:283
Read of size 1 at addr ffff88804d7e38a6 by task syz.2.3832/14726

CPU: 0 UID: 0 PID: 14726 Comm: syz.2.3832 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/18/2025
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:94 [inline]
 dump_stack_lvl+0x116/0x1f0 lib/dump_stack.c:120
 print_address_description mm/kasan/report.c:378 [inline]
 print_report+0xcd/0x630 mm/kasan/report.c:482
 kasan_report+0xe0/0x110 mm/kasan/report.c:595
 strcmp+0xa7/0xb0 lib/string.c:283
 hpfs_get_ea+0x1f9/0xc90 fs/hpfs/ea.c:139
 hpfs_read_inode+0x69e/0x1270 fs/hpfs/inode.c:63
 hpfs_fill_super+0x13e9/0x2230 fs/hpfs/super.c:654
 get_tree_bdev_flags+0x38c/0x620 fs/super.c:1692
 vfs_get_tree+0x8e/0x340 fs/super.c:1815
 do_new_mount fs/namespace.c:3808 [inline]
 path_mount+0x1513/0x2000 fs/namespace.c:4123
 do_mount fs/namespace.c:4136 [inline]
 __do_sys_mount fs/namespace.c:4347 [inline]
 __se_sys_mount fs/namespace.c:4324 [inline]
 __x64_sys_mount+0x28d/0x310 fs/namespace.c:4324
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xcd/0x4e0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f6954b9034a
Code: d8 64 89 02 48 c7 c0 ff ff ff ff eb a6 e8 de 1a 00 00 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 49 89 ca b8 a5 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f69559b6e68 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 00007f69559b6ef0 RCX: 00007f6954b9034a
RDX: 000020000000a000 RSI: 0000200000000000 RDI: 00007f69559b6eb0
RBP: 000020000000a000 R08: 00007f69559b6ef0 R09: 0000000003200041
R10: 0000000003200041 R11: 0000000000000246 R12: 0000200000000000
R13: 00007f69559b6eb0 R14: 0000000000009e15 R15: 0000200000000040
 </TASK>

The buggy address belongs to the physical page:
page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x7f098cb3a pfn:0x4d7e3
flags: 0xfff00000000000(node=0|zone=1|lastcpupid=0x7ff)
raw: 00fff00000000000 ffffea000135f908 ffffea000135f888 0000000000000000
raw: 00000007f098cb3a 0000000000000000 00000000ffffffff 0000000000000000
page dumped because: kasan: bad access detected
page_owner tracks the page as freed
page last allocated via order 0, migratetype Movable, gfp_mask 0x140dca(GFP_HIGHUSER_MOVABLE|__GFP_ZERO|__GFP_COMP), pid 14702, tgid 14701 (syz.3.3820), ts 607138110947, free_ts 607211234167
 set_page_owner include/linux/page_owner.h:32 [inline]
 post_alloc_hook+0x1c0/0x230 mm/page_alloc.c:1851
 prep_new_page mm/page_alloc.c:1859 [inline]
 get_page_from_freelist+0x132b/0x38e0 mm/page_alloc.c:3858
 __alloc_frozen_pages_noprof+0x261/0x23f0 mm/page_alloc.c:5148
 alloc_pages_mpol+0x1fb/0x550 mm/mempolicy.c:2416
 folio_alloc_mpol_noprof+0x36/0x2f0 mm/mempolicy.c:2435
 vma_alloc_folio_noprof+0xed/0x1e0 mm/mempolicy.c:2470
 folio_prealloc mm/memory.c:1061 [inline]
 alloc_anon_folio mm/memory.c:4997 [inline]
 do_anonymous_page mm/memory.c:5054 [inline]
 do_pte_missing+0x2230/0x3ba0 mm/memory.c:4232
 handle_pte_fault mm/memory.c:6052 [inline]
 __handle_mm_fault+0x152a/0x2a50 mm/memory.c:6195
 handle_mm_fault+0x589/0xd10 mm/memory.c:6364
 do_user_addr_fault+0x60c/0x1370 arch/x86/mm/fault.c:1336
 handle_page_fault arch/x86/mm/fault.c:1476 [inline]
 exc_page_fault+0x5c/0xb0 arch/x86/mm/fault.c:1532
 asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:623
page last free pid 14702 tgid 14701 stack trace:
 reset_page_owner include/linux/page_owner.h:25 [inline]
 free_pages_prepare mm/page_alloc.c:1395 [inline]
 free_unref_folios+0xa61/0x16b0 mm/page_alloc.c:2952
 folios_put_refs+0x56f/0x740 mm/swap.c:997
 free_pages_and_swap_cache+0x3f0/0x4a0 mm/swap_state.c:267
 __tlb_batch_free_encoded_pages+0xf9/0x290 mm/mmu_gather.c:136
 tlb_batch_pages_flush mm/mmu_gather.c:149 [inline]
 tlb_flush_mmu_free mm/mmu_gather.c:397 [inline]
 tlb_flush_mmu mm/mmu_gather.c:404 [inline]
 tlb_finish_mmu+0x168/0x7c0 mm/mmu_gather.c:497
 vms_clear_ptes+0x55e/0x770 mm/vma.c:1235
 vms_complete_munmap_vmas+0x1ca/0x970 mm/vma.c:1277
 do_vmi_align_munmap+0x43b/0x7d0 mm/vma.c:1536
 do_vmi_munmap+0x204/0x3e0 mm/vma.c:1584
 __vm_munmap+0x19a/0x390 mm/vma.c:3155
 __do_sys_munmap mm/mmap.c:1080 [inline]
 __se_sys_munmap mm/mmap.c:1077 [inline]
 __x64_sys_munmap+0x59/0x80 mm/mmap.c:1077
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xcd/0x4e0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

Memory state around the buggy address:
 ffff88804d7e3780: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
 ffff88804d7e3800: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
>ffff88804d7e3880: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
                               ^
 ffff88804d7e3900: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
 ffff88804d7e3980: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
==================================================================
==================================================================
BUG: KASAN: use-after-free in next_ea fs/hpfs/hpfs_fn.h:152 [inline]
BUG: KASAN: use-after-free in hpfs_get_ea+0xb51/0xc90 fs/hpfs/ea.c:138
Read of size 1 at addr ffff88804d7e38a3 by task syz.2.3832/14726

CPU: 1 UID: 0 PID: 14726 Comm: syz.2.3832 Tainted: G    B               syzkaller #0 PREEMPT(full) 
Tainted: [B]=BAD_PAGE
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/18/2025
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:94 [inline]
 dump_stack_lvl+0x116/0x1f0 lib/dump_stack.c:120
 print_address_description mm/kasan/report.c:378 [inline]
 print_report+0xcd/0x630 mm/kasan/report.c:482
 kasan_report+0xe0/0x110 mm/kasan/report.c:595
 next_ea fs/hpfs/hpfs_fn.h:152 [inline]
 hpfs_get_ea+0xb51/0xc90 fs/hpfs/ea.c:138
 hpfs_read_inode+0x69e/0x1270 fs/hpfs/inode.c:63
 hpfs_fill_super+0x13e9/0x2230 fs/hpfs/super.c:654
 get_tree_bdev_flags+0x38c/0x620 fs/super.c:1692
 vfs_get_tree+0x8e/0x340 fs/super.c:1815
 do_new_mount fs/namespace.c:3808 [inline]
 path_mount+0x1513/0x2000 fs/namespace.c:4123
 do_mount fs/namespace.c:4136 [inline]
 __do_sys_mount fs/namespace.c:4347 [inline]
 __se_sys_mount fs/namespace.c:4324 [inline]
 __x64_sys_mount+0x28d/0x310 fs/namespace.c:4324
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xcd/0x4e0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f6954b9034a
Code: d8 64 89 02 48 c7 c0 ff ff ff ff eb a6 e8 de 1a 00 00 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 49 89 ca b8 a5 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f69559b6e68 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 00007f69559b6ef0 RCX: 00007f6954b9034a
RDX: 000020000000a000 RSI: 0000200000000000 RDI: 00007f69559b6eb0
RBP: 000020000000a000 R08: 00007f69559b6ef0 R09: 0000000003200041
R10: 0000000003200041 R11: 0000000000000246 R12: 0000200000000000
R13: 00007f69559b6eb0 R14: 0000000000009e15 R15: 0000200000000040
 </TASK>

The buggy address belongs to the physical page:
page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x7f098cb3a pfn:0x4d7e3
flags: 0xfff00000000000(node=0|zone=1|lastcpupid=0x7ff)
raw: 00fff00000000000 ffffea000135f908 ffffea000135f888 0000000000000000
raw: 00000007f098cb3a 0000000000000000 00000000ffffffff 0000000000000000
page dumped because: kasan: bad access detected
page_owner tracks the page as freed
page last allocated via order 0, migratetype Movable, gfp_mask 0x140dca(GFP_HIGHUSER_MOVABLE|__GFP_ZERO|__GFP_COMP), pid 14702, tgid 14701 (syz.3.3820), ts 607138110947, free_ts 607211234167
 set_page_owner include/linux/page_owner.h:32 [inline]
 post_alloc_hook+0x1c0/0x230 mm/page_alloc.c:1851
 prep_new_page mm/page_alloc.c:1859 [inline]
 get_page_from_freelist+0x132b/0x38e0 mm/page_alloc.c:3858
 __alloc_frozen_pages_noprof+0x261/0x23f0 mm/page_alloc.c:5148
 alloc_pages_mpol+0x1fb/0x550 mm/mempolicy.c:2416
 folio_alloc_mpol_noprof+0x36/0x2f0 mm/mempolicy.c:2435
 vma_alloc_folio_noprof+0xed/0x1e0 mm/mempolicy.c:2470
 folio_prealloc mm/memory.c:1061 [inline]
 alloc_anon_folio mm/memory.c:4997 [inline]
 do_anonymous_page mm/memory.c:5054 [inline]
 do_pte_missing+0x2230/0x3ba0 mm/memory.c:4232
 handle_pte_fault mm/memory.c:6052 [inline]
 __handle_mm_fault+0x152a/0x2a50 mm/memory.c:6195
 handle_mm_fault+0x589/0xd10 mm/memory.c:6364
 do_user_addr_fault+0x60c/0x1370 arch/x86/mm/fault.c:1336
 handle_page_fault arch/x86/mm/fault.c:1476 [inline]
 exc_page_fault+0x5c/0xb0 arch/x86/mm/fault.c:1532
 asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:623
page last free pid 14702 tgid 14701 stack trace:
 reset_page_owner include/linux/page_owner.h:25 [inline]
 free_pages_prepare mm/page_alloc.c:1395 [inline]
 free_unref_folios+0xa61/0x16b0 mm/page_alloc.c:2952
 folios_put_refs+0x56f/0x740 mm/swap.c:997
 free_pages_and_swap_cache+0x3f0/0x4a0 mm/swap_state.c:267
 __tlb_batch_free_encoded_pages+0xf9/0x290 mm/mmu_gather.c:136
 tlb_batch_pages_flush mm/mmu_gather.c:149 [inline]
 tlb_flush_mmu_free mm/mmu_gather.c:397 [inline]
 tlb_flush_mmu mm/mmu_gather.c:404 [inline]
 tlb_finish_mmu+0x168/0x7c0 mm/mmu_gather.c:497
 vms_clear_ptes+0x55e/0x770 mm/vma.c:1235
 vms_complete_munmap_vmas+0x1ca/0x970 mm/vma.c:1277
 do_vmi_align_munmap+0x43b/0x7d0 mm/vma.c:1536
 do_vmi_munmap+0x204/0x3e0 mm/vma.c:1584
 __vm_munmap+0x19a/0x390 mm/vma.c:3155
 __do_sys_munmap mm/mmap.c:1080 [inline]
 __se_sys_munmap mm/mmap.c:1077 [inline]
 __x64_sys_munmap+0x59/0x80 mm/mmap.c:1077
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xcd/0x4e0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

Memory state around the buggy address:
 ffff88804d7e3780: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
 ffff88804d7e3800: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
>ffff88804d7e3880: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
                               ^
 ffff88804d7e3900: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
 ffff88804d7e3980: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
==================================================================
==================================================================
BUG: KASAN: use-after-free in ea_valuelen fs/hpfs/hpfs_fn.h:147 [inline]
BUG: KASAN: use-after-free in next_ea fs/hpfs/hpfs_fn.h:152 [inline]
BUG: KASAN: use-after-free in hpfs_get_ea+0xb42/0xc90 fs/hpfs/ea.c:138
Read of size 1 at addr ffff88804d7e38a4 by task syz.2.3832/14726

CPU: 0 UID: 0 PID: 14726 Comm: syz.2.3832 Tainted: G    B               syzkaller #0 PREEMPT(full) 
Tainted: [B]=BAD_PAGE
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/18/2025
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:94 [inline]
 dump_stack_lvl+0x116/0x1f0 lib/dump_stack.c:120
 print_address_description mm/kasan/report.c:378 [inline]
 print_report+0xcd/0x630 mm/kasan/report.c:482
 kasan_report+0xe0/0x110 mm/kasan/report.c:595
 ea_valuelen fs/hpfs/hpfs_fn.h:147 [inline]
 next_ea fs/hpfs/hpfs_fn.h:152 [inline]
 hpfs_get_ea+0xb42/0xc90 fs/hpfs/ea.c:138
 hpfs_read_inode+0x69e/0x1270 fs/hpfs/inode.c:63
 hpfs_fill_super+0x13e9/0x2230 fs/hpfs/super.c:654
 get_tree_bdev_flags+0x38c/0x620 fs/super.c:1692
 vfs_get_tree+0x8e/0x340 fs/super.c:1815
 do_new_mount fs/namespace.c:3808 [inline]
 path_mount+0x1513/0x2000 fs/namespace.c:4123
 do_mount fs/namespace.c:4136 [inline]
 __do_sys_mount fs/namespace.c:4347 [inline]
 __se_sys_mount fs/namespace.c:4324 [inline]
 __x64_sys_mount+0x28d/0x310 fs/namespace.c:4324
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xcd/0x4e0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f6954b9034a
Code: d8 64 89 02 48 c7 c0 ff ff ff ff eb a6 e8 de 1a 00 00 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 49 89 ca b8 a5 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f69559b6e68 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 00007f69559b6ef0 RCX: 00007f6954b9034a
RDX: 000020000000a000 RSI: 0000200000000000 RDI: 00007f69559b6eb0
RBP: 000020000000a000 R08: 00007f69559b6ef0 R09: 0000000003200041
R10: 0000000003200041 R11: 0000000000000246 R12: 0000200000000000
R13: 00007f69559b6eb0 R14: 0000000000009e15 R15: 0000200000000040
 </TASK>

The buggy address belongs to the physical page:
page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x7f098cb3a pfn:0x4d7e3
flags: 0xfff00000000000(node=0|zone=1|lastcpupid=0x7ff)
raw: 00fff00000000000 ffffea000135f908 ffffea000135f888 0000000000000000
raw: 00000007f098cb3a 0000000000000000 00000000ffffffff 0000000000000000
page dumped because: kasan: bad access detected
page_owner tracks the page as freed
page last allocated via order 0, migratetype Movable, gfp_mask 0x140dca(GFP_HIGHUSER_MOVABLE|__GFP_ZERO|__GFP_COMP), pid 14702, tgid 14701 (syz.3.3820), ts 607138110947, free_ts 607211234167
 set_page_owner include/linux/page_owner.h:32 [inline]
 post_alloc_hook+0x1c0/0x230 mm/page_alloc.c:1851
 prep_new_page mm/page_alloc.c:1859 [inline]
 get_page_from_freelist+0x132b/0x38e0 mm/page_alloc.c:3858
 __alloc_frozen_pages_noprof+0x261/0x23f0 mm/page_alloc.c:5148
 alloc_pages_mpol+0x1fb/0x550 mm/mempolicy.c:2416
 folio_alloc_mpol_noprof+0x36/0x2f0 mm/mempolicy.c:2435
 vma_alloc_folio_noprof+0xed/0x1e0 mm/mempolicy.c:2470
 folio_prealloc mm/memory.c:1061 [inline]
 alloc_anon_folio mm/memory.c:4997 [inline]
 do_anonymous_page mm/memory.c:5054 [inline]
 do_pte_missing+0x2230/0x3ba0 mm/memory.c:4232
 handle_pte_fault mm/memory.c:6052 [inline]
 __handle_mm_fault+0x152a/0x2a50 mm/memory.c:6195
 handle_mm_fault+0x589/0xd10 mm/memory.c:6364
 do_user_addr_fault+0x60c/0x1370 arch/x86/mm/fault.c:1336
 handle_page_fault arch/x86/mm/fault.c:1476 [inline]
 exc_page_fault+0x5c/0xb0 arch/x86/mm/fault.c:1532
 asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:623
page last free pid 14702 tgid 14701 stack trace:
 reset_page_owner include/linux/page_owner.h:25 [inline]
 free_pages_prepare mm/page_alloc.c:1395 [inline]
 free_unref_folios+0xa61/0x16b0 mm/page_alloc.c:2952
 folios_put_refs+0x56f/0x740 mm/swap.c:997
 free_pages_and_swap_cache+0x3f0/0x4a0 mm/swap_state.c:267
 __tlb_batch_free_encoded_pages+0xf9/0x290 mm/mmu_gather.c:136
 tlb_batch_pages_flush mm/mmu_gather.c:149 [inline]
 tlb_flush_mmu_free mm/mmu_gather.c:397 [inline]
 tlb_flush_mmu mm/mmu_gather.c:404 [inline]
 tlb_finish_mmu+0x168/0x7c0 mm/mmu_gather.c:497
 vms_clear_ptes+0x55e/0x770 mm/vma.c:1235
 vms_complete_munmap_vmas+0x1ca/0x970 mm/vma.c:1277
 do_vmi_align_munmap+0x43b/0x7d0 mm/vma.c:1536
 do_vmi_munmap+0x204/0x3e0 mm/vma.c:1584
 __vm_munmap+0x19a/0x390 mm/vma.c:3155
 __do_sys_munmap mm/mmap.c:1080 [inline]
 __se_sys_munmap mm/mmap.c:1077 [inline]
 __x64_sys_munmap+0x59/0x80 mm/mmap.c:1077
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xcd/0x4e0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

Memory state around the buggy address:
 ffff88804d7e3780: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
 ffff88804d7e3800: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
>ffff88804d7e3880: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
                               ^
 ffff88804d7e3900: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
 ffff88804d7e3980: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
==================================================================
==================================================================
BUG: KASAN: use-after-free in ea_valuelen fs/hpfs/hpfs_fn.h:147 [inline]
BUG: KASAN: use-after-free in next_ea fs/hpfs/hpfs_fn.h:152 [inline]
BUG: KASAN: use-after-free in hpfs_get_ea+0xb64/0xc90 fs/hpfs/ea.c:138
Read of size 1 at addr ffff88804d7e38a5 by task syz.2.3832/14726

CPU: 1 UID: 0 PID: 14726 Comm: syz.2.3832 Tainted: G    B               syzkaller #0 PREEMPT(full) 
Tainted: [B]=BAD_PAGE
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/18/2025
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:94 [inline]
 dump_stack_lvl+0x116/0x1f0 lib/dump_stack.c:120
 print_address_description mm/kasan/report.c:378 [inline]
 print_report+0xcd/0x630 mm/kasan/report.c:482
 kasan_report+0xe0/0x110 mm/kasan/report.c:595
 ea_valuelen fs/hpfs/hpfs_fn.h:147 [inline]
 next_ea fs/hpfs/hpfs_fn.h:152 [inline]
 hpfs_get_ea+0xb64/0xc90 fs/hpfs/ea.c:138
 hpfs_read_inode+0x69e/0x1270 fs/hpfs/inode.c:63
 hpfs_fill_super+0x13e9/0x2230 fs/hpfs/super.c:654
 get_tree_bdev_flags+0x38c/0x620 fs/super.c:1692
 vfs_get_tree+0x8e/0x340 fs/super.c:1815
 do_new_mount fs/namespace.c:3808 [inline]
 path_mount+0x1513/0x2000 fs/namespace.c:4123
 do_mount fs/namespace.c:4136 [inline]
 __do_sys_mount fs/namespace.c:4347 [inline]
 __se_sys_mount fs/namespace.c:4324 [inline]
 __x64_sys_mount+0x28d/0x310 fs/namespace.c:4324
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xcd/0x4e0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f6954b9034a
Code: d8 64 89 02 48 c7 c0 ff ff ff ff eb a6 e8 de 1a 00 00 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 49 89 ca b8 a5 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f69559b6e68 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 00007f69559b6ef0 RCX: 00007f6954b9034a
RDX: 000020000000a000 RSI: 0000200000000000 RDI: 00007f69559b6eb0
RBP: 000020000000a000 R08: 00007f69559b6ef0 R09: 0000000003200041
R10: 0000000003200041 R11: 0000000000000246 R12: 0000200000000000
R13: 00007f69559b6eb0 R14: 0000000000009e15 R15: 0000200000000040
 </TASK>

The buggy address belongs to the physical page:
page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x7f098cb3a pfn:0x4d7e3
flags: 0xfff00000000000(node=0|zone=1|lastcpupid=0x7ff)
raw: 00fff00000000000 ffffea000135f908 ffffea000135f888 0000000000000000
raw: 00000007f098cb3a 0000000000000000 00000000ffffffff 0000000000000000
page dumped because: kasan: bad access detected
page_owner tracks the page as freed
page last allocated via order 0, migratetype Movable, gfp_mask 0x140dca(GFP_HIGHUSER_MOVABLE|__GFP_ZERO|__GFP_COMP), pid 14702, tgid 14701 (syz.3.3820), ts 607138110947, free_ts 607211234167
 set_page_owner include/linux/page_owner.h:32 [inline]
 post_alloc_hook+0x1c0/0x230 mm/page_alloc.c:1851
 prep_new_page mm/page_alloc.c:1859 [inline]
 get_page_from_freelist+0x132b/0x38e0 mm/page_alloc.c:3858
 __alloc_frozen_pages_noprof+0x261/0x23f0 mm/page_alloc.c:5148
 alloc_pages_mpol+0x1fb/0x550 mm/mempolicy.c:2416
 folio_alloc_mpol_noprof+0x36/0x2f0 mm/mempolicy.c:2435
 vma_alloc_folio_noprof+0xed/0x1e0 mm/mempolicy.c:2470
 folio_prealloc mm/memory.c:1061 [inline]
 alloc_anon_folio mm/memory.c:4997 [inline]
 do_anonymous_page mm/memory.c:5054 [inline]
 do_pte_missing+0x2230/0x3ba0 mm/memory.c:4232
 handle_pte_fault mm/memory.c:6052 [inline]
 __handle_mm_fault+0x152a/0x2a50 mm/memory.c:6195
 handle_mm_fault+0x589/0xd10 mm/memory.c:6364
 do_user_addr_fault+0x60c/0x1370 arch/x86/mm/fault.c:1336
 handle_page_fault arch/x86/mm/fault.c:1476 [inline]
 exc_page_fault+0x5c/0xb0 arch/x86/mm/fault.c:1532
 asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:623
page last free pid 14702 tgid 14701 stack trace:
 reset_page_owner include/linux/page_owner.h:25 [inline]
 free_pages_prepare mm/page_alloc.c:1395 [inline]
 free_unref_folios+0xa61/0x16b0 mm/page_alloc.c:2952
 folios_put_refs+0x56f/0x740 mm/swap.c:997
 free_pages_and_swap_cache+0x3f0/0x4a0 mm/swap_state.c:267
 __tlb_batch_free_encoded_pages+0xf9/0x290 mm/mmu_gather.c:136
 tlb_batch_pages_flush mm/mmu_gather.c:149 [inline]
 tlb_flush_mmu_free mm/mmu_gather.c:397 [inline]
 tlb_flush_mmu mm/mmu_gather.c:404 [inline]
 tlb_finish_mmu+0x168/0x7c0 mm/mmu_gather.c:497
 vms_clear_ptes+0x55e/0x770 mm/vma.c:1235
 vms_complete_munmap_vmas+0x1ca/0x970 mm/vma.c:1277
 do_vmi_align_munmap+0x43b/0x7d0 mm/vma.c:1536
 do_vmi_munmap+0x204/0x3e0 mm/vma.c:1584
 __vm_munmap+0x19a/0x390 mm/vma.c:3155
 __do_sys_munmap mm/mmap.c:1080 [inline]
 __se_sys_munmap mm/mmap.c:1077 [inline]
 __x64_sys_munmap+0x59/0x80 mm/mmap.c:1077
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xcd/0x4e0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

Memory state around the buggy address:
 ffff88804d7e3780: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
 ffff88804d7e3800: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
>ffff88804d7e3880: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
                               ^
 ffff88804d7e3900: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
 ffff88804d7e3980: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
==================================================================
hpfs: hpfs_map_sector(): read error
==================================================================
BUG: KASAN: use-after-free in strcmp+0xa7/0xb0 lib/string.c:283
Read of size 1 at addr ffff88804d7e38a6 by task syz.2.3832/14726

CPU: 1 UID: 0 PID: 14726 Comm: syz.2.3832 Tainted: G    B               syzkaller #0 PREEMPT(full) 
Tainted: [B]=BAD_PAGE
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/18/2025
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:94 [inline]
 dump_stack_lvl+0x116/0x1f0 lib/dump_stack.c:120
 print_address_description mm/kasan/report.c:378 [inline]
 print_report+0xcd/0x630 mm/kasan/report.c:482
 kasan_report+0xe0/0x110 mm/kasan/report.c:595
 strcmp+0xa7/0xb0 lib/string.c:283
 hpfs_get_ea+0x1f9/0xc90 fs/hpfs/ea.c:139
 hpfs_read_inode+0x711/0x1270 fs/hpfs/inode.c:70
 hpfs_fill_super+0x13e9/0x2230 fs/hpfs/super.c:654
 get_tree_bdev_flags+0x38c/0x620 fs/super.c:1692
 vfs_get_tree+0x8e/0x340 fs/super.c:1815
 do_new_mount fs/namespace.c:3808 [inline]
 path_mount+0x1513/0x2000 fs/namespace.c:4123
 do_mount fs/namespace.c:4136 [inline]
 __do_sys_mount fs/namespace.c:4347 [inline]
 __se_sys_mount fs/namespace.c:4324 [inline]
 __x64_sys_mount+0x28d/0x310 fs/namespace.c:4324
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xcd/0x4e0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f6954b9034a
Code: d8 64 89 02 48 c7 c0 ff ff ff ff eb a6 e8 de 1a 00 00 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 49 89 ca b8 a5 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f69559b6e68 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 00007f69559b6ef0 RCX: 00007f6954b9034a
RDX: 000020000000a000 RSI: 0000200000000000 RDI: 00007f69559b6eb0
RBP: 000020000000a000 R08: 00007f69559b6ef0 R09: 0000000003200041
R10: 0000000003200041 R11: 0000000000000246 R12: 0000200000000000
R13: 00007f69559b6eb0 R14: 0000000000009e15 R15: 0000200000000040
 </TASK>

The buggy address belongs to the physical page:
page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x7f098cb3a pfn:0x4d7e3
flags: 0xfff00000000000(node=0|zone=1|lastcpupid=0x7ff)
raw: 00fff00000000000 ffffea000135f908 ffffea000135f888 0000000000000000
raw: 00000007f098cb3a 0000000000000000 00000000ffffffff 0000000000000000
page dumped because: kasan: bad access detected
page_owner tracks the page as freed
page last allocated via order 0, migratetype Movable, gfp_mask 0x140dca(GFP_HIGHUSER_MOVABLE|__GFP_ZERO|__GFP_COMP), pid 14702, tgid 14701 (syz.3.3820), ts 607138110947, free_ts 607211234167
 set_page_owner include/linux/page_owner.h:32 [inline]
 post_alloc_hook+0x1c0/0x230 mm/page_alloc.c:1851
 prep_new_page mm/page_alloc.c:1859 [inline]
 get_page_from_freelist+0x132b/0x38e0 mm/page_alloc.c:3858
 __alloc_frozen_pages_noprof+0x261/0x23f0 mm/page_alloc.c:5148
 alloc_pages_mpol+0x1fb/0x550 mm/mempolicy.c:2416
 folio_alloc_mpol_noprof+0x36/0x2f0 mm/mempolicy.c:2435
 vma_alloc_folio_noprof+0xed/0x1e0 mm/mempolicy.c:2470
 folio_prealloc mm/memory.c:1061 [inline]
 alloc_anon_folio mm/memory.c:4997 [inline]
 do_anonymous_page mm/memory.c:5054 [inline]
 do_pte_missing+0x2230/0x3ba0 mm/memory.c:4232
 handle_pte_fault mm/memory.c:6052 [inline]
 __handle_mm_fault+0x152a/0x2a50 mm/memory.c:6195
 handle_mm_fault+0x589/0xd10 mm/memory.c:6364
 do_user_addr_fault+0x60c/0x1370 arch/x86/mm/fault.c:1336
 handle_page_fault arch/x86/mm/fault.c:1476 [inline]
 exc_page_fault+0x5c/0xb0 arch/x86/mm/fault.c:1532
 asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:623
page last free pid 14702 tgid 14701 stack trace:
 reset_page_owner include/linux/page_owner.h:25 [inline]
 free_pages_prepare mm/page_alloc.c:1395 [inline]
 free_unref_folios+0xa61/0x16b0 mm/page_alloc.c:2952
 folios_put_refs+0x56f/0x740 mm/swap.c:997
 free_pages_and_swap_cache+0x3f0/0x4a0 mm/swap_state.c:267
 __tlb_batch_free_encoded_pages+0xf9/0x290 mm/mmu_gather.c:136
 tlb_batch_pages_flush mm/mmu_gather.c:149 [inline]
 tlb_flush_mmu_free mm/mmu_gather.c:397 [inline]
 tlb_flush_mmu mm/mmu_gather.c:404 [inline]
 tlb_finish_mmu+0x168/0x7c0 mm/mmu_gather.c:497
 vms_clear_ptes+0x55e/0x770 mm/vma.c:1235
 vms_complete_munmap_vmas+0x1ca/0x970 mm/vma.c:1277
 do_vmi_align_munmap+0x43b/0x7d0 mm/vma.c:1536
 do_vmi_munmap+0x204/0x3e0 mm/vma.c:1584
 __vm_munmap+0x19a/0x390 mm/vma.c:3155
 __do_sys_munmap mm/mmap.c:1080 [inline]
 __se_sys_munmap mm/mmap.c:1077 [inline]
 __x64_sys_munmap+0x59/0x80 mm/mmap.c:1077
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xcd/0x4e0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

Memory state around the buggy address:
 ffff88804d7e3780: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
 ffff88804d7e3800: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
>ffff88804d7e3880: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
                               ^
 ffff88804d7e3900: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
 ffff88804d7e3980: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
==================================================================
==================================================================
BUG: KASAN: use-after-free in next_ea fs/hpfs/hpfs_fn.h:152 [inline]
BUG: KASAN: use-after-free in hpfs_get_ea+0xb51/0xc90 fs/hpfs/ea.c:138
Read of size 1 at addr ffff88804d7e38a3 by task syz.2.3832/14726

CPU: 0 UID: 0 PID: 14726 Comm: syz.2.3832 Tainted: G    B               syzkaller #0 PREEMPT(full) 
Tainted: [B]=BAD_PAGE
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/18/2025
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:94 [inline]
 dump_stack_lvl+0x116/0x1f0 lib/dump_stack.c:120
 print_address_description mm/kasan/report.c:378 [inline]
 print_report+0xcd/0x630 mm/kasan/report.c:482
 kasan_report+0xe0/0x110 mm/kasan/report.c:595
 next_ea fs/hpfs/hpfs_fn.h:152 [inline]
 hpfs_get_ea+0xb51/0xc90 fs/hpfs/ea.c:138
 hpfs_read_inode+0x711/0x1270 fs/hpfs/inode.c:70
 hpfs_fill_super+0x13e9/0x2230 fs/hpfs/super.c:654
 get_tree_bdev_flags+0x38c/0x620 fs/super.c:1692
 vfs_get_tree+0x8e/0x340 fs/super.c:1815
 do_new_mount fs/namespace.c:3808 [inline]
 path_mount+0x1513/0x2000 fs/namespace.c:4123
 do_mount fs/namespace.c:4136 [inline]
 __do_sys_mount fs/namespace.c:4347 [inline]
 __se_sys_mount fs/namespace.c:4324 [inline]
 __x64_sys_mount+0x28d/0x310 fs/namespace.c:4324
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xcd/0x4e0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f6954b9034a
Code: d8 64 89 02 48 c7 c0 ff ff ff ff eb a6 e8 de 1a 00 00 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 49 89 ca b8 a5 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f69559b6e68 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 00007f69559b6ef0 RCX: 00007f6954b9034a
RDX: 000020000000a000 RSI: 0000200000000000 RDI: 00007f69559b6eb0
RBP: 000020000000a000 R08: 00007f69559b6ef0 R09: 0000000003200041
R10: 0000000003200041 R11: 0000000000000246 R12: 0000200000000000
R13: 00007f69559b6eb0 R14: 0000000000009e15 R15: 0000200000000040
 </TASK>

The buggy address belongs to the physical page:
page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x7f098cb3a pfn:0x4d7e3
flags: 0xfff00000000000(node=0|zone=1|lastcpupid=0x7ff)
raw: 00fff00000000000 ffffea000135f908 ffffea000135f888 0000000000000000
raw: 00000007f098cb3a 0000000000000000 00000000ffffffff 0000000000000000
page dumped because: kasan: bad access detected
page_owner tracks the page as freed
page last allocated via order 0, migratetype Movable, gfp_mask 0x140dca(GFP_HIGHUSER_MOVABLE|__GFP_ZERO|__GFP_COMP), pid 14702, tgid 14701 (syz.3.3820), ts 607138110947, free_ts 607211234167
 set_page_owner include/linux/page_owner.h:32 [inline]
 post_alloc_hook+0x1c0/0x230 mm/page_alloc.c:1851
 prep_new_page mm/page_alloc.c:1859 [inline]
 get_page_from_freelist+0x132b/0x38e0 mm/page_alloc.c:3858
 __alloc_frozen_pages_noprof+0x261/0x23f0 mm/page_alloc.c:5148
 alloc_pages_mpol+0x1fb/0x550 mm/mempolicy.c:2416
 folio_alloc_mpol_noprof+0x36/0x2f0 mm/mempolicy.c:2435
 vma_alloc_folio_noprof+0xed/0x1e0 mm/mempolicy.c:2470
 folio_prealloc mm/memory.c:1061 [inline]
 alloc_anon_folio mm/memory.c:4997 [inline]
 do_anonymous_page mm/memory.c:5054 [inline]
 do_pte_missing+0x2230/0x3ba0 mm/memory.c:4232
 handle_pte_fault mm/memory.c:6052 [inline]
 __handle_mm_fault+0x152a/0x2a50 mm/memory.c:6195
 handle_mm_fault+0x589/0xd10 mm/memory.c:6364
 do_user_addr_fault+0x60c/0x1370 arch/x86/mm/fault.c:1336
 handle_page_fault arch/x86/mm/fault.c:1476 [inline]
 exc_page_fault+0x5c/0xb0 arch/x86/mm/fault.c:1532
 asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:623
page last free pid 14702 tgid 14701 stack trace:
 reset_page_owner include/linux/page_owner.h:25 [inline]
 free_pages_prepare mm/page_alloc.c:1395 [inline]
 free_unref_folios+0xa61/0x16b0 mm/page_alloc.c:2952
 folios_put_refs+0x56f/0x740 mm/swap.c:997
 free_pages_and_swap_cache+0x3f0/0x4a0 mm/swap_state.c:267
 __tlb_batch_free_encoded_pages+0xf9/0x290 mm/mmu_gather.c:136
 tlb_batch_pages_flush mm/mmu_gather.c:149 [inline]
 tlb_flush_mmu_free mm/mmu_gather.c:397 [inline]
 tlb_flush_mmu mm/mmu_gather.c:404 [inline]
 tlb_finish_mmu+0x168/0x7c0 mm/mmu_gather.c:497
 vms_clear_ptes+0x55e/0x770 mm/vma.c:1235
 vms_complete_munmap_vmas+0x1ca/0x970 mm/vma.c:1277
 do_vmi_align_munmap+0x43b/0x7d0 mm/vma.c:1536
 do_vmi_munmap+0x204/0x3e0 mm/vma.c:1584
 __vm_munmap+0x19a/0x390 mm/vma.c:3155
 __do_sys_munmap mm/mmap.c:1080 [inline]
 __se_sys_munmap mm/mmap.c:1077 [inline]
 __x64_sys_munmap+0x59/0x80 mm/mmap.c:1077
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xcd/0x4e0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

Memory state around the buggy address:
 ffff88804d7e3780: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
 ffff88804d7e3800: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
>ffff88804d7e3880: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
                               ^
 ffff88804d7e3900: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
 ffff88804d7e3980: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
==================================================================
==================================================================
BUG: KASAN: use-after-free in ea_valuelen fs/hpfs/hpfs_fn.h:147 [inline]
BUG: KASAN: use-after-free in next_ea fs/hpfs/hpfs_fn.h:152 [inline]
BUG: KASAN: use-after-free in hpfs_get_ea+0xb42/0xc90 fs/hpfs/ea.c:138
Read of size 1 at addr ffff88804d7e38a4 by task syz.2.3832/14726

CPU: 1 UID: 0 PID: 14726 Comm: syz.2.3832 Tainted: G    B               syzkaller #0 PREEMPT(full) 
Tainted: [B]=BAD_PAGE
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/18/2025
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:94 [inline]
 dump_stack_lvl+0x116/0x1f0 lib/dump_stack.c:120
 print_address_description mm/kasan/report.c:378 [inline]
 print_report+0xcd/0x630 mm/kasan/report.c:482
 kasan_report+0xe0/0x110 mm/kasan/report.c:595
 ea_valuelen fs/hpfs/hpfs_fn.h:147 [inline]
 next_ea fs/hpfs/hpfs_fn.h:152 [inline]
 hpfs_get_ea+0xb42/0xc90 fs/hpfs/ea.c:138
 hpfs_read_inode+0x711/0x1270 fs/hpfs/inode.c:70
 hpfs_fill_super+0x13e9/0x2230 fs/hpfs/super.c:654
 get_tree_bdev_flags+0x38c/0x620 fs/super.c:1692
 vfs_get_tree+0x8e/0x340 fs/super.c:1815
 do_new_mount fs/namespace.c:3808 [inline]
 path_mount+0x1513/0x2000 fs/namespace.c:4123
 do_mount fs/namespace.c:4136 [inline]
 __do_sys_mount fs/namespace.c:4347 [inline]
 __se_sys_mount fs/namespace.c:4324 [inline]
 __x64_sys_mount+0x28d/0x310 fs/namespace.c:4324
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xcd/0x4e0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f6954b9034a
Code: d8 64 89 02 48 c7 c0 ff ff ff ff eb a6 e8 de 1a 00 00 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 49 89 ca b8 a5 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f69559b6e68 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 00007f69559b6ef0 RCX: 00007f6954b9034a
RDX: 000020000000a000 RSI: 0000200000000000 RDI: 00007f69559b6eb0
RBP: 000020000000a000 R08: 00007f69559b6ef0 R09: 0000000003200041
R10: 0000000003200041 R11: 0000000000000246 R12: 0000200000000000
R13: 00007f69559b6eb0 R14: 0000000000009e15 R15: 0000200000000040
 </TASK>

The buggy address belongs to the physical page:
page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x7f098cb3a pfn:0x4d7e3
flags: 0xfff00000000000(node=0|zone=1|lastcpupid=0x7ff)
raw: 00fff00000000000 ffffea000135f908 ffffea000135f888 0000000000000000
raw: 00000007f098cb3a 0000000000000000 00000000ffffffff 0000000000000000
page dumped because: kasan: bad access detected
page_owner tracks the page as freed
page last allocated via order 0, migratetype Movable, gfp_mask 0x140dca(GFP_HIGHUSER_MOVABLE|__GFP_ZERO|__GFP_COMP), pid 14702, tgid 14701 (syz.3.3820), ts 607138110947, free_ts 607211234167
 set_page_owner include/linux/page_owner.h:32 [inline]
 post_alloc_hook+0x1c0/0x230 mm/page_alloc.c:1851
 prep_new_page mm/page_alloc.c:1859 [inline]
 get_page_from_freelist+0x132b/0x38e0 mm/page_alloc.c:3858
 __alloc_frozen_pages_noprof+0x261/0x23f0 mm/page_alloc.c:5148
 alloc_pages_mpol+0x1fb/0x550 mm/mempolicy.c:2416
 folio_alloc_mpol_noprof+0x36/0x2f0 mm/mempolicy.c:2435
 vma_alloc_folio_noprof+0xed/0x1e0 mm/mempolicy.c:2470
 folio_prealloc mm/memory.c:1061 [inline]
 alloc_anon_folio mm/memory.c:4997 [inline]
 do_anonymous_page mm/memory.c:5054 [inline]
 do_pte_missing+0x2230/0x3ba0 mm/memory.c:4232
 handle_pte_fault mm/memory.c:6052 [inline]
 __handle_mm_fault+0x152a/0x2a50 mm/memory.c:6195
 handle_mm_fault+0x589/0xd10 mm/memory.c:6364
 do_user_addr_fault+0x60c/0x1370 arch/x86/mm/fault.c:1336
 handle_page_fault arch/x86/mm/fault.c:1476 [inline]
 exc_page_fault+0x5c/0xb0 arch/x86/mm/fault.c:1532
 asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:623
page last free pid 14702 tgid 14701 stack trace:
 reset_page_owner include/linux/page_owner.h:25 [inline]
 free_pages_prepare mm/page_alloc.c:1395 [inline]
 free_unref_folios+0xa61/0x16b0 mm/page_alloc.c:2952
 folios_put_refs+0x56f/0x740 mm/swap.c:997
 free_pages_and_swap_cache+0x3f0/0x4a0 mm/swap_state.c:267
 __tlb_batch_free_encoded_pages+0xf9/0x290 mm/mmu_gather.c:136
 tlb_batch_pages_flush mm/mmu_gather.c:149 [inline]
 tlb_flush_mmu_free mm/mmu_gather.c:397 [inline]
 tlb_flush_mmu mm/mmu_gather.c:404 [inline]
 tlb_finish_mmu+0x168/0x7c0 mm/mmu_gather.c:497
 vms_clear_ptes+0x55e/0x770 mm/vma.c:1235
 vms_complete_munmap_vmas+0x1ca/0x970 mm/vma.c:1277
 do_vmi_align_munmap+0x43b/0x7d0 mm/vma.c:1536
 do_vmi_munmap+0x204/0x3e0 mm/vma.c:1584
 __vm_munmap+0x19a/0x390 mm/vma.c:3155
 __do_sys_munmap mm/mmap.c:1080 [inline]
 __se_sys_munmap mm/mmap.c:1077 [inline]
 __x64_sys_munmap+0x59/0x80 mm/mmap.c:1077
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xcd/0x4e0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

Memory state around the buggy address:
 ffff88804d7e3780: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
 ffff88804d7e3800: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
>ffff88804d7e3880: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
                               ^
 ffff88804d7e3900: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
 ffff88804d7e3980: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
==================================================================
==================================================================
BUG: KASAN: use-after-free in ea_valuelen fs/hpfs/hpfs_fn.h:147 [inline]
BUG: KASAN: use-after-free in next_ea fs/hpfs/hpfs_fn.h:152 [inline]
BUG: KASAN: use-after-free in hpfs_get_ea+0xb64/0xc90 fs/hpfs/ea.c:138
Read of size 1 at addr ffff88804d7e38a5 by task syz.2.3832/14726

CPU: 0 UID: 0 PID: 14726 Comm: syz.2.3832 Tainted: G    B               syzkaller #0 PREEMPT(full) 
Tainted: [B]=BAD_PAGE
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/18/2025
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:94 [inline]
 dump_stack_lvl+0x116/0x1f0 lib/dump_stack.c:120
 print_address_description mm/kasan/report.c:378 [inline]
 print_report+0xcd/0x630 mm/kasan/report.c:482
 kasan_report+0xe0/0x110 mm/kasan/report.c:595
 ea_valuelen fs/hpfs/hpfs_fn.h:147 [inline]
 next_ea fs/hpfs/hpfs_fn.h:152 [inline]
 hpfs_get_ea+0xb64/0xc90 fs/hpfs/ea.c:138
 hpfs_read_inode+0x711/0x1270 fs/hpfs/inode.c:70
 hpfs_fill_super+0x13e9/0x2230 fs/hpfs/super.c:654
 get_tree_bdev_flags+0x38c/0x620 fs/super.c:1692
 vfs_get_tree+0x8e/0x340 fs/super.c:1815
 do_new_mount fs/namespace.c:3808 [inline]
 path_mount+0x1513/0x2000 fs/namespace.c:4123
 do_mount fs/namespace.c:4136 [inline]
 __do_sys_mount fs/namespace.c:4347 [inline]
 __se_sys_mount fs/namespace.c:4324 [inline]
 __x64_sys_mount+0x28d/0x310 fs/namespace.c:4324
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xcd/0x4e0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f6954b9034a
Code: d8 64 89 02 48 c7 c0 ff ff ff ff eb a6 e8 de 1a 00 00 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 49 89 ca b8 a5 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f69559b6e68 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 00007f69559b6ef0 RCX: 00007f6954b9034a
RDX: 000020000000a000 RSI: 0000200000000000 RDI: 00007f69559b6eb0
RBP: 000020000000a000 R08: 00007f69559b6ef0 R09: 0000000003200041
R10: 0000000003200041 R11: 0000000000000246 R12: 0000200000000000
R13: 00007f69559b6eb0 R14: 0000000000009e15 R15: 0000200000000040
 </TASK>

The buggy address belongs to the physical page:
page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x7f098cb3a pfn:0x4d7e3
flags: 0xfff00000000000(node=0|zone=1|lastcpupid=0x7ff)
raw: 00fff00000000000 ffffea000135f908 ffffea000135f888 0000000000000000
raw: 00000007f098cb3a 0000000000000000 00000000ffffffff 0000000000000000
page dumped because: kasan: bad access detected
page_owner tracks the page as freed
page last allocated via order 0, migratetype Movable, gfp_mask 0x140dca(GFP_HIGHUSER_MOVABLE|__GFP_ZERO|__GFP_COMP), pid 14702, tgid 14701 (syz.3.3820), ts 607138110947, free_ts 607211234167
 set_page_owner include/linux/page_owner.h:32 [inline]
 post_alloc_hook+0x1c0/0x230 mm/page_alloc.c:1851
 prep_new_page mm/page_alloc.c:1859 [inline]
 get_page_from_freelist+0x132b/0x38e0 mm/page_alloc.c:3858
 __alloc_frozen_pages_noprof+0x261/0x23f0 mm/page_alloc.c:5148
 alloc_pages_mpol+0x1fb/0x550 mm/mempolicy.c:2416
 folio_alloc_mpol_noprof+0x36/0x2f0 mm/mempolicy.c:2435
 vma_alloc_folio_noprof+0xed/0x1e0 mm/mempolicy.c:2470
 folio_prealloc mm/memory.c:1061 [inline]
 alloc_anon_folio mm/memory.c:4997 [inline]
 do_anonymous_page mm/memory.c:5054 [inline]
 do_pte_missing+0x2230/0x3ba0 mm/memory.c:4232
 handle_pte_fault mm/memory.c:6052 [inline]
 __handle_mm_fault+0x152a/0x2a50 mm/memory.c:6195
 handle_mm_fault+0x589/0xd10 mm/memory.c:6364
 do_user_addr_fault+0x60c/0x1370 arch/x86/mm/fault.c:1336
 handle_page_fault arch/x86/mm/fault.c:1476 [inline]
 exc_page_fault+0x5c/0xb0 arch/x86/mm/fault.c:1532
 asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:623
page last free pid 14702 tgid 14701 stack trace:
 reset_page_owner include/linux/page_owner.h:25 [inline]
 free_pages_prepare mm/page_alloc.c:1395 [inline]
 free_unref_folios+0xa61/0x16b0 mm/page_alloc.c:2952
 folios_put_refs+0x56f/0x740 mm/swap.c:997
 free_pages_and_swap_cache+0x3f0/0x4a0 mm/swap_state.c:267
 __tlb_batch_free_encoded_pages+0xf9/0x290 mm/mmu_gather.c:136
 tlb_batch_pages_flush mm/mmu_gather.c:149 [inline]
 tlb_flush_mmu_free mm/mmu_gather.c:397 [inline]
 tlb_flush_mmu mm/mmu_gather.c:404 [inline]
 tlb_finish_mmu+0x168/0x7c0 mm/mmu_gather.c:497
 vms_clear_ptes+0x55e/0x770 mm/vma.c:1235
 vms_complete_munmap_vmas+0x1ca/0x970 mm/vma.c:1277
 do_vmi_align_munmap+0x43b/0x7d0 mm/vma.c:1536
 do_vmi_munmap+0x204/0x3e0 mm/vma.c:1584
 __vm_munmap+0x19a/0x390 mm/vma.c:3155
 __do_sys_munmap mm/mmap.c:1080 [inline]
 __se_sys_munmap mm/mmap.c:1077 [inline]
 __x64_sys_munmap+0x59/0x80 mm/mmap.c:1077
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xcd/0x4e0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

Memory state around the buggy address:
 ffff88804d7e3780: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
 ffff88804d7e3800: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
>ffff88804d7e3880: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
                               ^
 ffff88804d7e3900: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
 ffff88804d7e3980: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
==================================================================
hpfs: hpfs_map_sector(): read error
==================================================================
BUG: KASAN: use-after-free in strcmp+0xa7/0xb0 lib/string.c:283
Read of size 1 at addr ffff88804d7e38a6 by task syz.2.3832/14726

CPU: 1 UID: 0 PID: 14726 Comm: syz.2.3832 Tainted: G    B               syzkaller #0 PREEMPT(full) 
Tainted: [B]=BAD_PAGE
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/18/2025
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:94 [inline]
 dump_stack_lvl+0x116/0x1f0 lib/dump_stack.c:120
 print_address_description mm/kasan/report.c:378 [inline]
 print_report+0xcd/0x630 mm/kasan/report.c:482
 kasan_report+0xe0/0x110 mm/kasan/report.c:595
 strcmp+0xa7/0xb0 lib/string.c:283
 hpfs_get_ea+0x1f9/0xc90 fs/hpfs/ea.c:139
 hpfs_read_inode+0x784/0x1270 fs/hpfs/inode.c:77
 hpfs_fill_super+0x13e9/0x2230 fs/hpfs/super.c:654
 get_tree_bdev_flags+0x38c/0x620 fs/super.c:1692
 vfs_get_tree+0x8e/0x340 fs/super.c:1815
 do_new_mount fs/namespace.c:3808 [inline]
 path_mount+0x1513/0x2000 fs/namespace.c:4123
 do_mount fs/namespace.c:4136 [inline]
 __do_sys_mount fs/namespace.c:4347 [inline]
 __se_sys_mount fs/namespace.c:4324 [inline]
 __x64_sys_mount+0x28d/0x310 fs/namespace.c:4324
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xcd/0x4e0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f6954b9034a
Code: d8 64 89 02 48 c7 c0 ff ff ff ff eb a6 e8 de 1a 00 00 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 49 89 ca b8 a5 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f69559b6e68 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 00007f69559b6ef0 RCX: 00007f6954b9034a
RDX: 000020000000a000 RSI: 0000200000000000 RDI: 00007f69559b6eb0
RBP: 000020000000a000 R08: 00007f69559b6ef0 R09: 0000000003200041
R10: 0000000003200041 R11: 0000000000000246 R12: 0000200000000000
R13: 00007f69559b6eb0 R14: 0000000000009e15 R15: 0000200000000040
 </TASK>

The buggy address belongs to the physical page:
page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x7f098cb3a pfn:0x4d7e3
flags: 0xfff00000000000(node=0|zone=1|lastcpupid=0x7ff)
raw: 00fff00000000000 ffffea000135f908 ffffea000135f888 0000000000000000
raw: 00000007f098cb3a 0000000000000000 00000000ffffffff 0000000000000000
page dumped because: kasan: bad access detected
page_owner tracks the page as freed
page last allocated via order 0, migratetype Movable, gfp_mask 0x140dca(GFP_HIGHUSER_MOVABLE|__GFP_ZERO|__GFP_COMP), pid 14702, tgid 14701 (syz.3.3820), ts 607138110947, free_ts 607211234167
 set_page_owner include/linux/page_owner.h:32 [inline]
 post_alloc_hook+0x1c0/0x230 mm/page_alloc.c:1851
 prep_new_page mm/page_alloc.c:1859 [inline]
 get_page_from_freelist+0x132b/0x38e0 mm/page_alloc.c:3858
 __alloc_frozen_pages_noprof+0x261/0x23f0 mm/page_alloc.c:5148
 alloc_pages_mpol+0x1fb/0x550 mm/mempolicy.c:2416
 folio_alloc_mpol_noprof+0x36/0x2f0 mm/mempolicy.c:2435
 vma_alloc_folio_noprof+0xed/0x1e0 mm/mempolicy.c:2470
 folio_prealloc mm/memory.c:1061 [inline]
 alloc_anon_folio mm/memory.c:4997 [inline]
 do_anonymous_page mm/memory.c:5054 [inline]
 do_pte_missing+0x2230/0x3ba0 mm/memory.c:4232
 handle_pte_fault mm/memory.c:6052 [inline]
 __handle_mm_fault+0x152a/0x2a50 mm/memory.c:6195
 handle_mm_fault+0x589/0xd10 mm/memory.c:6364
 do_user_addr_fault+0x60c/0x1370 arch/x86/mm/fault.c:1336
 handle_page_fault arch/x86/mm/fault.c:1476 [inline]
 exc_page_fault+0x5c/0xb0 arch/x86/mm/fault.c:1532
 asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:623
page last free pid 14702 tgid 14701 stack trace:
 reset_page_owner include/linux/page_owner.h:25 [inline]
 free_pages_prepare mm/page_alloc.c:1395 [inline]
 free_unref_folios+0xa61/0x16b0 mm/page_alloc.c:2952
 folios_put_refs+0x56f/0x740 mm/swap.c:997
 free_pages_and_swap_cache+0x3f0/0x4a0 mm/swap_state.c:267
 __tlb_batch_free_encoded_pages+0xf9/0x290 mm/mmu_gather.c:136
 tlb_batch_pages_flush mm/mmu_gather.c:149 [inline]
 tlb_flush_mmu_free mm/mmu_gather.c:397 [inline]
 tlb_flush_mmu mm/mmu_gather.c:404 [inline]
 tlb_finish_mmu+0x168/0x7c0 mm/mmu_gather.c:497
 vms_clear_ptes+0x55e/0x770 mm/vma.c:1235
 vms_complete_munmap_vmas+0x1ca/0x970 mm/vma.c:1277
 do_vmi_align_munmap+0x43b/0x7d0 mm/vma.c:1536
 do_vmi_munmap+0x204/0x3e0 mm/vma.c:1584
 __vm_munmap+0x19a/0x390 mm/vma.c:3155
 __do_sys_munmap mm/mmap.c:1080 [inline]
 __se_sys_munmap mm/mmap.c:1077 [inline]
 __x64_sys_munmap+0x59/0x80 mm/mmap.c:1077
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xcd/0x4e0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

Memory state around the buggy address:
 ffff88804d7e3780: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
 ffff88804d7e3800: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
>ffff88804d7e3880: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
                               ^
 ffff88804d7e3900: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
 ffff88804d7e3980: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
==================================================================
==================================================================
BUG: KASAN: use-after-free in next_ea fs/hpfs/hpfs_fn.h:152 [inline]
BUG: KASAN: use-after-free in hpfs_get_ea+0xb51/0xc90 fs/hpfs/ea.c:138
Read of size 1 at addr ffff88804d7e38a3 by task syz.2.3832/14726

CPU: 0 UID: 0 PID: 14726 Comm: syz.2.3832 Tainted: G    B               syzkaller #0 PREEMPT(full) 
Tainted: [B]=BAD_PAGE
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/18/2025
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:94 [inline]
 dump_stack_lvl+0x116/0x1f0 lib/dump_stack.c:120
 print_address_description mm/kasan/report.c:378 [inline]
 print_report+0xcd/0x630 mm/kasan/report.c:482
 kasan_report+0xe0/0x110 mm/kasan/report.c:595
 next_ea fs/hpfs/hpfs_fn.h:152 [inline]
 hpfs_get_ea+0xb51/0xc90 fs/hpfs/ea.c:138
 hpfs_read_inode+0x784/0x1270 fs/hpfs/inode.c:77
 hpfs_fill_super+0x13e9/0x2230 fs/hpfs/super.c:654
 get_tree_bdev_flags+0x38c/0x620 fs/super.c:1692
 vfs_get_tree+0x8e/0x340 fs/super.c:1815
 do_new_mount fs/namespace.c:3808 [inline]
 path_mount+0x1513/0x2000 fs/namespace.c:4123
 do_mount fs/namespace.c:4136 [inline]
 __do_sys_mount fs/namespace.c:4347 [inline]
 __se_sys_mount fs/namespace.c:4324 [inline]
 __x64_sys_mount+0x28d/0x310 fs/namespace.c:4324
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xcd/0x4e0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f6954b9034a
Code: d8 64 89 02 48 c7 c0 ff ff ff ff eb a6 e8 de 1a 00 00 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 49 89 ca b8 a5 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f69559b6e68 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 00007f69559b6ef0 RCX: 00007f6954b9034a
RDX: 000020000000a000 RSI: 0000200000000000 RDI: 00007f69559b6eb0
RBP: 000020000000a000 R08: 00007f69559b6ef0 R09: 0000000003200041
R10: 0000000003200041 R11: 0000000000000246 R12: 0000200000000000
R13: 00007f69559b6eb0 R14: 0000000000009e15 R15: 0000200000000040
 </TASK>

The buggy address belongs to the physical page:
page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x7f098cb3a pfn:0x4d7e3
flags: 0xfff00000000000(node=0|zone=1|lastcpupid=0x7ff)
raw: 00fff00000000000 ffffea000135f908 ffffea000135f888 0000000000000000
raw: 00000007f098cb3a 0000000000000000 00000000ffffffff 0000000000000000
page dumped because: kasan: bad access detected
page_owner tracks the page as freed
page last allocated via order 0, migratetype Movable, gfp_mask 0x140dca(GFP_HIGHUSER_MOVABLE|__GFP_ZERO|__GFP_COMP), pid 14702, tgid 14701 (syz.3.3820), ts 607138110947, free_ts 607211234167
 set_page_owner include/linux/page_owner.h:32 [inline]
 post_alloc_hook+0x1c0/0x230 mm/page_alloc.c:1851
 prep_new_page mm/page_alloc.c:1859 [inline]
 get_page_from_freelist+0x132b/0x38e0 mm/page_alloc.c:3858
 __alloc_frozen_pages_noprof+0x261/0x23f0 mm/page_alloc.c:5148
 alloc_pages_mpol+0x1fb/0x550 mm/mempolicy.c:2416
 folio_alloc_mpol_noprof+0x36/0x2f0 mm/mempolicy.c:2435
 vma_alloc_folio_noprof+0xed/0x1e0 mm/mempolicy.c:2470
 folio_prealloc mm/memory.c:1061 [inline]
 alloc_anon_folio mm/memory.c:4997 [inline]
 do_anonymous_page mm/memory.c:5054 [inline]
 do_pte_missing+0x2230/0x3ba0 mm/memory.c:4232
 handle_pte_fault mm/memory.c:6052 [inline]
 __handle_mm_fault+0x152a/0x2a50 mm/memory.c:6195
 handle_mm_fault+0x589/0xd10 mm/memory.c:6364
 do_user_addr_fault+0x60c/0x1370 arch/x86/mm/fault.c:1336
 handle_page_fault arch/x86/mm/fault.c:1476 [inline]
 exc_page_fault+0x5c/0xb0 arch/x86/mm/fault.c:1532
 asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:623
page last free pid 14702 tgid 14701 stack trace:
 reset_page_owner include/linux/page_owner.h:25 [inline]
 free_pages_prepare mm/page_alloc.c:1395 [inline]
 free_unref_folios+0xa61/0x16b0 mm/page_alloc.c:2952
 folios_put_refs+0x56f/0x740 mm/swap.c:997
 free_pages_and_swap_cache+0x3f0/0x4a0 mm/swap_state.c:267
 __tlb_batch_free_encoded_pages+0xf9/0x290 mm/mmu_gather.c:136
 tlb_batch_pages_flush mm/mmu_gather.c:149 [inline]
 tlb_flush_mmu_free mm/mmu_gather.c:397 [inline]
 tlb_flush_mmu mm/mmu_gather.c:404 [inline]
 tlb_finish_mmu+0x168/0x7c0 mm/mmu_gather.c:497
 vms_clear_ptes+0x55e/0x770 mm/vma.c:1235
 vms_complete_munmap_vmas+0x1ca/0x970 mm/vma.c:1277
 do_vmi_align_munmap+0x43b/0x7d0 mm/vma.c:1536
 do_vmi_munmap+0x204/0x3e0 mm/vma.c:1584
 __vm_munmap+0x19a/0x390 mm/vma.c:3155
 __do_sys_munmap mm/mmap.c:1080 [inline]
 __se_sys_munmap mm/mmap.c:1077 [inline]
 __x64_sys_munmap+0x59/0x80 mm/mmap.c:1077
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xcd/0x4e0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

Memory state around the buggy address:
 ffff88804d7e3780: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
 ffff88804d7e3800: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
>ffff88804d7e3880: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
                               ^
 ffff88804d7e3900: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
 ffff88804d7e3980: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
==================================================================
==================================================================
BUG: KASAN: use-after-free in ea_valuelen fs/hpfs/hpfs_fn.h:147 [inline]
BUG: KASAN: use-after-free in next_ea fs/hpfs/hpfs_fn.h:152 [inline]
BUG: KASAN: use-after-free in hpfs_get_ea+0xb42/0xc90 fs/hpfs/ea.c:138
Read of size 1 at addr ffff88804d7e38a4 by task syz.2.3832/14726

CPU: 0 UID: 0 PID: 14726 Comm: syz.2.3832 Tainted: G    B               syzkaller #0 PREEMPT(full) 
Tainted: [B]=BAD_PAGE
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/18/2025
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:94 [inline]
 dump_stack_lvl+0x116/0x1f0 lib/dump_stack.c:120
 print_address_description mm/kasan/report.c:378 [inline]
 print_report+0xcd/0x630 mm/kasan/report.c:482
 kasan_report+0xe0/0x110 mm/kasan/report.c:595
 ea_valuelen fs/hpfs/hpfs_fn.h:147 [inline]
 next_ea fs/hpfs/hpfs_fn.h:152 [inline]
 hpfs_get_ea+0xb42/0xc90 fs/hpfs/ea.c:138
 hpfs_read_inode+0x784/0x1270 fs/hpfs/inode.c:77
 hpfs_fill_super+0x13e9/0x2230 fs/hpfs/super.c:654
 get_tree_bdev_flags+0x38c/0x620 fs/super.c:1692
 vfs_get_tree+0x8e/0x340 fs/super.c:1815
 do_new_mount fs/namespace.c:3808 [inline]
 path_mount+0x1513/0x2000 fs/namespace.c:4123
 do_mount fs/namespace.c:4136 [inline]
 __do_sys_mount fs/namespace.c:4347 [inline]
 __se_sys_mount fs/namespace.c:4324 [inline]
 __x64_sys_mount+0x28d/0x310 fs/namespace.c:4324
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xcd/0x4e0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f6954b9034a
Code: d8 64 89 02 48 c7 c0 ff ff ff ff eb a6 e8 de 1a 00 00 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 49 89 ca b8 a5 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f69559b6e68 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 00007f69559b6ef0 RCX: 00007f6954b9034a
RDX: 000020000000a000 RSI: 0000200000000000 RDI: 00007f69559b6eb0
RBP: 000020000000a000 R08: 00007f69559b6ef0 R09: 0000000003200041
R10: 0000000003200041 R11: 0000000000000246 R12: 0000200000000000
R13: 00007f69559b6eb0 R14: 0000000000009e15 R15: 0000200000000040
 </TASK>

The buggy address belongs to the physical page:
page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x7f098cb3a pfn:0x4d7e3
flags: 0xfff00000000000(node=0|zone=1|lastcpupid=0x7ff)
raw: 00fff00000000000 ffffea000135f908 ffffea000135f888 0000000000000000
raw: 00000007f098cb3a 0000000000000000 00000000ffffffff 0000000000000000
page dumped because: kasan: bad access detected
page_owner tracks the page as freed
page last allocated via order 0, migratetype Movable, gfp_mask 0x140dca(GFP_HIGHUSER_MOVABLE|__GFP_ZERO|__GFP_COMP), pid 14702, tgid 14701 (syz.3.3820), ts 607138110947, free_ts 607211234167
 set_page_owner include/linux/page_owner.h:32 [inline]
 post_alloc_hook+0x1c0/0x230 mm/page_alloc.c:1851
 prep_new_page mm/page_alloc.c:1859 [inline]
 get_page_from_freelist+0x132b/0x38e0 mm/page_alloc.c:3858
 __alloc_frozen_pages_noprof+0x261/0x23f0 mm/page_alloc.c:5148
 alloc_pages_mpol+0x1fb/0x550 mm/mempolicy.c:2416
 folio_alloc_mpol_noprof+0x36/0x2f0 mm/mempolicy.c:2435
 vma_alloc_folio_noprof+0xed/0x1e0 mm/mempolicy.c:2470
 folio_prealloc mm/memory.c:1061 [inline]
 alloc_anon_folio mm/memory.c:4997 [inline]
 do_anonymous_page mm/memory.c:5054 [inline]
 do_pte_missing+0x2230/0x3ba0 mm/memory.c:4232
 handle_pte_fault mm/memory.c:6052 [inline]
 __handle_mm_fault+0x152a/0x2a50 mm/memory.c:6195
 handle_mm_fault+0x589/0xd10 mm/memory.c:6364
 do_user_addr_fault+0x60c/0x1370 arch/x86/mm/fault.c:1336
 handle_page_fault arch/x86/mm/fault.c:1476 [inline]
 exc_page_fault+0x5c/0xb0 arch/x86/mm/fault.c:1532
 asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:623
page last free pid 14702 tgid 14701 stack trace:
 reset_page_owner include/linux/page_owner.h:25 [inline]
 free_pages_prepare mm/page_alloc.c:1395 [inline]
 free_unref_folios+0xa61/0x16b0 mm/page_alloc.c:2952
 folios_put_refs+0x56f/0x740 mm/swap.c:997
 free_pages_and_swap_cache+0x3f0/0x4a0 mm/swap_state.c:267
 __tlb_batch_free_encoded_pages+0xf9/0x290 mm/mmu_gather.c:136
 tlb_batch_pages_flush mm/mmu_gather.c:149 [inline]
 tlb_flush_mmu_free mm/mmu_gather.c:397 [inline]
 tlb_flush_mmu mm/mmu_gather.c:404 [inline]
 tlb_finish_mmu+0x168/0x7c0 mm/mmu_gather.c:497
 vms_clear_ptes+0x55e/0x770 mm/vma.c:1235
 vms_complete_munmap_vmas+0x1ca/0x970 mm/vma.c:1277
 do_vmi_align_munmap+0x43b/0x7d0 mm/vma.c:1536
 do_vmi_munmap+0x204/0x3e0 mm/vma.c:1584
 __vm_munmap+0x19a/0x390 mm/vma.c:3155
 __do_sys_munmap mm/mmap.c:1080 [inline]
 __se_sys_munmap mm/mmap.c:1077 [inline]
 __x64_sys_munmap+0x59/0x80 mm/mmap.c:1077
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xcd/0x4e0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

Memory state around the buggy address:
 ffff88804d7e3780: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
 ffff88804d7e3800: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
>ffff88804d7e3880: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
                               ^
 ffff88804d7e3900: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
 ffff88804d7e3980: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
==================================================================
==================================================================
BUG: KASAN: use-after-free in ea_valuelen fs/hpfs/hpfs_fn.h:147 [inline]
BUG: KASAN: use-after-free in next_ea fs/hpfs/hpfs_fn.h:152 [inline]
BUG: KASAN: use-after-free in hpfs_get_ea+0xb64/0xc90 fs/hpfs/ea.c:138
Read of size 1 at addr ffff88804d7e38a5 by task syz.2.3832/14726

CPU: 1 UID: 0 PID: 14726 Comm: syz.2.3832 Tainted: G    B               syzkaller #0 PREEMPT(full) 
Tainted: [B]=BAD_PAGE
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/18/2025
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:94 [inline]
 dump_stack_lvl+0x116/0x1f0 lib/dump_stack.c:120
 print_address_description mm/kasan/report.c:378 [inline]
 print_report+0xcd/0x630 mm/kasan/report.c:482
 kasan_report+0xe0/0x110 mm/kasan/report.c:595
 ea_valuelen fs/hpfs/hpfs_fn.h:147 [inline]
 next_ea fs/hpfs/hpfs_fn.h:152 [inline]
 hpfs_get_ea+0xb64/0xc90 fs/hpfs/ea.c:138
 hpfs_read_inode+0x784/0x1270 fs/hpfs/inode.c:77
 hpfs_fill_super+0x13e9/0x2230 fs/hpfs/super.c:654
 get_tree_bdev_flags+0x38c/0x620 fs/super.c:1692
 vfs_get_tree+0x8e/0x340 fs/super.c:1815
 do_new_mount fs/namespace.c:3808 [inline]
 path_mount+0x1513/0x2000 fs/namespace.c:4123
 do_mount fs/namespace.c:4136 [inline]
 __do_sys_mount fs/namespace.c:4347 [inline]
 __se_sys_mount fs/namespace.c:4324 [inline]
 __x64_sys_mount+0x28d/0x310 fs/namespace.c:4324
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xcd/0x4e0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f6954b9034a
Code: d8 64 89 02 48 c7 c0 ff ff ff ff eb a6 e8 de 1a 00 00 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 49 89 ca b8 a5 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f69559b6e68 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 00007f69559b6ef0 RCX: 00007f6954b9034a
RDX: 000020000000a000 RSI: 0000200000000000 RDI: 00007f69559b6eb0
RBP: 000020000000a000 R08: 00007f69559b6ef0 R09: 0000000003200041
R10: 0000000003200041 R11: 0000000000000246 R12: 0000200000000000
R13: 00007f69559b6eb0 R14: 0000000000009e15 R15: 0000200000000040
 </TASK>

The buggy address belongs to the physical page:
page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x7f098cb3a pfn:0x4d7e3
flags: 0xfff00000000000(node=0|zone=1|lastcpupid=0x7ff)
raw: 00fff00000000000 ffffea000135f908 ffffea000135f888 0000000000000000
raw: 00000007f098cb3a 0000000000000000 00000000ffffffff 0000000000000000
page dumped because: kasan: bad access detected
page_owner tracks the page as freed
page last allocated via order 0, migratetype Movable, gfp_mask 0x140dca(GFP_HIGHUSER_MOVABLE|__GFP_ZERO|__GFP_COMP), pid 14702, tgid 14701 (syz.3.3820), ts 607138110947, free_ts 607211234167
 set_page_owner include/linux/page_owner.h:32 [inline]
 post_alloc_hook+0x1c0/0x230 mm/page_alloc.c:1851
 prep_new_page mm/page_alloc.c:1859 [inline]
 get_page_from_freelist+0x132b/0x38e0 mm/page_alloc.c:3858
 __alloc_frozen_pages_noprof+0x261/0x23f0 mm/page_alloc.c:5148
 alloc_pages_mpol+0x1fb/0x550 mm/mempolicy.c:2416
 folio_alloc_mpol_noprof+0x36/0x2f0 mm/mempolicy.c:2435
 vma_alloc_folio_noprof+0xed/0x1e0 mm/mempolicy.c:2470
 folio_prealloc mm/memory.c:1061 [inline]
 alloc_anon_folio mm/memory.c:4997 [inline]
 do_anonymous_page mm/memory.c:5054 [inline]
 do_pte_missing+0x2230/0x3ba0 mm/memory.c:4232
 handle_pte_fault mm/memory.c:6052 [inline]
 __handle_mm_fault+0x152a/0x2a50 mm/memory.c:6195
 handle_mm_fault+0x589/0xd10 mm/memory.c:6364
 do_user_addr_fault+0x60c/0x1370 arch/x86/mm/fault.c:1336
 handle_page_fault arch/x86/mm/fault.c:1476 [inline]
 exc_page_fault+0x5c/0xb0 arch/x86/mm/fault.c:1532
 asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:623
page last free pid 14702 tgid 14701 stack trace:
 reset_page_owner include/linux/page_owner.h:25 [inline]
 free_pages_prepare mm/page_alloc.c:1395 [inline]
 free_unref_folios+0xa61/0x16b0 mm/page_alloc.c:2952
 folios_put_refs+0x56f/0x740 mm/swap.c:997
 free_pages_and_swap_cache+0x3f0/0x4a0 mm/swap_state.c:267
 __tlb_batch_free_encoded_pages+0xf9/0x290 mm/mmu_gather.c:136
 tlb_batch_pages_flush mm/mmu_gather.c:149 [inline]
 tlb_flush_mmu_free mm/mmu_gather.c:397 [inline]
 tlb_flush_mmu mm/mmu_gather.c:404 [inline]
 tlb_finish_mmu+0x168/0x7c0 mm/mmu_gather.c:497
 vms_clear_ptes+0x55e/0x770 mm/vma.c:1235
 vms_complete_munmap_vmas+0x1ca/0x970 mm/vma.c:1277
 do_vmi_align_munmap+0x43b/0x7d0 mm/vma.c:1536
 do_vmi_munmap+0x204/0x3e0 mm/vma.c:1584
 __vm_munmap+0x19a/0x390 mm/vma.c:3155
 __do_sys_munmap mm/mmap.c:1080 [inline]
 __se_sys_munmap mm/mmap.c:1077 [inline]
 __x64_sys_munmap+0x59/0x80 mm/mmap.c:1077
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xcd/0x4e0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

Memory state around the buggy address:
 ffff88804d7e3780: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
 ffff88804d7e3800: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
>ffff88804d7e3880: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
                               ^
 ffff88804d7e3900: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
 ffff88804d7e3980: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
==================================================================
hpfs: hpfs_map_sector(): read error
==================================================================
BUG: KASAN: use-after-free in strcmp+0xa7/0xb0 lib/string.c:283
Read of size 1 at addr ffff88804d7e38a6 by task syz.2.3832/14726

CPU: 0 UID: 0 PID: 14726 Comm: syz.2.3832 Tainted: G    B               syzkaller #0 PREEMPT(full) 
Tainted: [B]=BAD_PAGE
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/18/2025
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:94 [inline]
 dump_stack_lvl+0x116/0x1f0 lib/dump_stack.c:120
 print_address_description mm/kasan/report.c:378 [inline]
 print_report+0xcd/0x630 mm/kasan/report.c:482
 kasan_report+0xe0/0x110 mm/kasan/report.c:595
 strcmp+0xa7/0xb0 lib/string.c:283
 hpfs_get_ea+0x1f9/0xc90 fs/hpfs/ea.c:139
 hpfs_read_inode+0x95f/0x1270 fs/hpfs/inode.c:89
 hpfs_fill_super+0x13e9/0x2230 fs/hpfs/super.c:654
 get_tree_bdev_flags+0x38c/0x620 fs/super.c:1692
 vfs_get_tree+0x8e/0x340 fs/super.c:1815
 do_new_mount fs/namespace.c:3808 [inline]
 path_mount+0x1513/0x2000 fs/namespace.c:4123
 do_mount fs/namespace.c:4136 [inline]
 __do_sys_mount fs/namespace.c:4347 [inline]
 __se_sys_mount fs/namespace.c:4324 [inline]
 __x64_sys_mount+0x28d/0x310 fs/namespace.c:4324
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xcd/0x4e0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f6954b9034a
Code: d8 64 89 02 48 c7 c0 ff ff ff ff eb a6 e8 de 1a 00 00 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 49 89 ca b8 a5 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f69559b6e68 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 00007f69559b6ef0 RCX: 00007f6954b9034a
RDX: 000020000000a000 RSI: 0000200000000000 RDI: 00007f69559b6eb0
RBP: 000020000000a000 R08: 00007f69559b6ef0 R09: 0000000003200041
R10: 0000000003200041 R11: 0000000000000246 R12: 0000200000000000
R13: 00007f69559b6eb0 R14: 0000000000009e15 R15: 0000200000000040
 </TASK>

The buggy address belongs to the physical page:
page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x7f098cb3a pfn:0x4d7e3
flags: 0xfff00000000000(node=0|zone=1|lastcpupid=0x7ff)
raw: 00fff00000000000 ffffea000135f908 ffffea000135f888 0000000000000000
raw: 00000007f098cb3a 0000000000000000 00000000ffffffff 0000000000000000
page dumped because: kasan: bad access detected
page_owner tracks the page as freed
page last allocated via order 0, migratetype Movable, gfp_mask 0x140dca(GFP_HIGHUSER_MOVABLE|__GFP_ZERO|__GFP_COMP), pid 14702, tgid 14701 (syz.3.3820), ts 607138110947, free_ts 607211234167
 set_page_owner include/linux/page_owner.h:32 [inline]
 post_alloc_hook+0x1c0/0x230 mm/page_alloc.c:1851
 prep_new_page mm/page_alloc.c:1859 [inline]
 get_page_from_freelist+0x132b/0x38e0 mm/page_alloc.c:3858
 __alloc_frozen_pages_noprof+0x261/0x23f0 mm/page_alloc.c:5148
 alloc_pages_mpol+0x1fb/0x550 mm/mempolicy.c:2416
 folio_alloc_mpol_noprof+0x36/0x2f0 mm/mempolicy.c:2435
 vma_alloc_folio_noprof+0xed/0x1e0 mm/mempolicy.c:2470
 folio_prealloc mm/memory.c:1061 [inline]
 alloc_anon_folio mm/memory.c:4997 [inline]
 do_anonymous_page mm/memory.c:5054 [inline]
 do_pte_missing+0x2230/0x3ba0 mm/memory.c:4232
 handle_pte_fault mm/memory.c:6052 [inline]
 __handle_mm_fault+0x152a/0x2a50 mm/memory.c:6195
 handle_mm_fault+0x589/0xd10 mm/memory.c:6364
 do_user_addr_fault+0x60c/0x1370 arch/x86/mm/fault.c:1336
 handle_page_fault arch/x86/mm/fault.c:1476 [inline]
 exc_page_fault+0x5c/0xb0 arch/x86/mm/fault.c:1532
 asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:623
page last free pid 14702 tgid 14701 stack trace:
 reset_page_owner include/linux/page_owner.h:25 [inline]
 free_pages_prepare mm/page_alloc.c:1395 [inline]
 free_unref_folios+0xa61/0x16b0 mm/page_alloc.c:2952
 folios_put_refs+0x56f/0x740 mm/swap.c:997
 free_pages_and_swap_cache+0x3f0/0x4a0 mm/swap_state.c:267
 __tlb_batch_free_encoded_pages+0xf9/0x290 mm/mmu_gather.c:136
 tlb_batch_pages_flush mm/mmu_gather.c:149 [inline]
 tlb_flush_mmu_free mm/mmu_gather.c:397 [inline]
 tlb_flush_mmu mm/mmu_gather.c:404 [inline]
 tlb_finish_mmu+0x168/0x7c0 mm/mmu_gather.c:497
 vms_clear_ptes+0x55e/0x770 mm/vma.c:1235
 vms_complete_munmap_vmas+0x1ca/0x970 mm/vma.c:1277
 do_vmi_align_munmap+0x43b/0x7d0 mm/vma.c:1536
 do_vmi_munmap+0x204/0x3e0 mm/vma.c:1584
 __vm_munmap+0x19a/0x390 mm/vma.c:3155
 __do_sys_munmap mm/mmap.c:1080 [inline]
 __se_sys_munmap mm/mmap.c:1077 [inline]
 __x64_sys_munmap+0x59/0x80 mm/mmap.c:1077
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xcd/0x4e0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

Memory state around the buggy address:
 ffff88804d7e3780: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
 ffff88804d7e3800: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
>ffff88804d7e3880: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
                               ^
 ffff88804d7e3900: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
 ffff88804d7e3980: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
==================================================================
==================================================================
BUG: KASAN: use-after-free in next_ea fs/hpfs/hpfs_fn.h:152 [inline]
BUG: KASAN: use-after-free in hpfs_get_ea+0xb51/0xc90 fs/hpfs/ea.c:138
Read of size 1 at addr ffff88804d7e38a3 by task syz.2.3832/14726

CPU: 1 UID: 0 PID: 14726 Comm: syz.2.3832 Tainted: G    B               syzkaller #0 PREEMPT(full) 
Tainted: [B]=BAD_PAGE
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/18/2025
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:94 [inline]
 dump_stack_lvl+0x116/0x1f0 lib/dump_stack.c:120
 print_address_description mm/kasan/report.c:378 [inline]
 print_report+0xcd/0x630 mm/kasan/report.c:482
 kasan_report+0xe0/0x110 mm/kasan/report.c:595
 next_ea fs/hpfs/hpfs_fn.h:152 [inline]
 hpfs_get_ea+0xb51/0xc90 fs/hpfs/ea.c:138
 hpfs_read_inode+0x95f/0x1270 fs/hpfs/inode.c:89
 hpfs_fill_super+0x13e9/0x2230 fs/hpfs/super.c:654
 get_tree_bdev_flags+0x38c/0x620 fs/super.c:1692
 vfs_get_tree+0x8e/0x340 fs/super.c:1815
 do_new_mount fs/namespace.c:3808 [inline]
 path_mount+0x1513/0x2000 fs/namespace.c:4123
 do_mount fs/namespace.c:4136 [inline]
 __do_sys_mount fs/namespace.c:4347 [inline]
 __se_sys_mount fs/namespace.c:4324 [inline]
 __x64_sys_mount+0x28d/0x310 fs/namespace.c:4324
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xcd/0x4e0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f6954b9034a
Code: d8 64 89 02 48 c7 c0 ff ff ff ff eb a6 e8 de 1a 00 00 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 49 89 ca b8 a5 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f69559b6e68 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 00007f69559b6ef0 RCX: 00007f6954b9034a
RDX: 000020000000a000 RSI: 0000200000000000 RDI: 00007f69559b6eb0
RBP: 000020000000a000 R08: 00007f69559b6ef0 R09: 0000000003200041
R10: 0000000003200041 R11: 0000000000000246 R12: 0000200000000000
R13: 00007f69559b6eb0 R14: 0000000000009e15 R15: 0000200000000040
 </TASK>

The buggy address belongs to the physical page:
page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x7f098cb3a pfn:0x4d7e3
flags: 0xfff00000000000(node=0|zone=1|lastcpupid=0x7ff)
raw: 00fff00000000000 ffffea000135f908 ffffea000135f888 0000000000000000
raw: 00000007f098cb3a 0000000000000000 00000000ffffffff 0000000000000000