hpfs: code page support is disabled ================================================================== BUG: KASAN: use-after-free in strcmp+0x67/0xb0 lib/string.c:361 Read of size 1 at addr ffff88805111b003 by task syz.3.2413/12881 CPU: 0 PID: 12881 Comm: syz.3.2413 Not tainted syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/09/2026 Call Trace: dump_stack_lvl+0x188/0x24e lib/dump_stack.c:106 print_address_description mm/kasan/report.c:316 [inline] print_report+0xa8/0x210 mm/kasan/report.c:420 kasan_report+0x10b/0x140 mm/kasan/report.c:524 strcmp+0x67/0xb0 lib/string.c:361 hpfs_get_ea+0x134/0xda0 fs/hpfs/ea.c:139 hpfs_read_inode+0x1a6/0x1050 fs/hpfs/inode.c:63 hpfs_fill_super+0x12ee/0x1f30 fs/hpfs/super.c:712 mount_bdev+0x28a/0x3c0 fs/super.c:1443 legacy_get_tree+0xe6/0x180 fs/fs_context.c:632 vfs_get_tree+0x88/0x270 fs/super.c:1573 do_new_mount+0x247/0xa40 fs/namespace.c:3078 do_mount fs/namespace.c:3421 [inline] __do_sys_mount fs/namespace.c:3629 [inline] __se_sys_mount+0x2e3/0x3d0 fs/namespace.c:3606 do_syscall_x64 arch/x86/entry/common.c:46 [inline] do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:76 entry_SYSCALL_64_after_hwframe+0x68/0xd2 RIP: 0033:0x7f4354d9f0ca Code: 48 c7 c2 e8 ff ff ff f7 d8 64 89 02 b8 ff ff ff ff c3 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 e8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f4355c7de58 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5 RAX: ffffffffffffffda RBX: 00007f4355c7dee0 RCX: 00007f4354d9f0ca RDX: 000020000000a000 RSI: 0000200000009ec0 RDI: 00007f4355c7dea0 RBP: 000020000000a000 R08: 00007f4355c7dee0 R09: 0000000003a00041 R10: 0000000003a00041 R11: 0000000000000246 R12: 0000200000009ec0 R13: 00007f4355c7dea0 R14: 0000000000009e2f R15: 0000200000000000 The buggy address belongs to the physical page: page:ffffea00014446c0 refcount:0 mapcount:0 mapping:0000000000000000 index:0x1 pfn:0x5111b flags: 0xfff00000000000(node=0|zone=1|lastcpupid=0x7ff) raw: 00fff00000000000 ffffea000125c808 ffffea00013d3208 0000000000000000 raw: 0000000000000001 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_COMP|__GFP_ZERO), pid 12851, tgid 12843 (syz.1.2406), ts 948997003100, free_ts 949418700578 set_page_owner include/linux/page_owner.h:31 [inline] post_alloc_hook+0x173/0x1a0 mm/page_alloc.c:2560 prep_new_page mm/page_alloc.c:2567 [inline] get_page_from_freelist+0x206b/0x2180 mm/page_alloc.c:4358 __alloc_pages+0x1ec/0x4f0 mm/page_alloc.c:5658 __folio_alloc+0xe/0x30 mm/page_alloc.c:5690 vma_alloc_folio+0x499/0x900 mm/mempolicy.c:2243 alloc_page_vma include/linux/gfp.h:284 [inline] wp_page_copy+0x24b/0x1660 mm/memory.c:3146 handle_pte_fault mm/memory.c:5047 [inline] __handle_mm_fault mm/memory.c:5171 [inline] handle_mm_fault+0x1b1b/0x3d40 mm/memory.c:5292 do_user_addr_fault+0x58e/0xb20 arch/x86/mm/fault.c:1338 handle_page_fault arch/x86/mm/fault.c:1429 [inline] exc_page_fault+0x60/0x100 arch/x86/mm/fault.c:1482 asm_exc_page_fault+0x22/0x30 arch/x86/include/asm/idtentry.h:608 page last free stack trace: reset_page_owner include/linux/page_owner.h:24 [inline] free_pages_prepare mm/page_alloc.c:1487 [inline] free_pcp_prepare mm/page_alloc.c:1537 [inline] free_unref_page_prepare+0x8e5/0x9e0 mm/page_alloc.c:3414 free_unref_page_list+0xbb/0x8e0 mm/page_alloc.c:3555 release_pages+0x20d1/0x2340 mm/swap.c:1035 tlb_batch_pages_flush mm/mmu_gather.c:60 [inline] tlb_flush_mmu_free mm/mmu_gather.c:255 [inline] tlb_flush_mmu+0x105/0x220 mm/mmu_gather.c:262 zap_pte_range mm/memory.c:1523 [inline] zap_pmd_range mm/memory.c:1572 [inline] zap_pud_range mm/memory.c:1601 [inline] zap_p4d_range mm/memory.c:1622 [inline] unmap_page_range+0x2037/0x25b0 mm/memory.c:1643 unmap_vmas+0x260/0x390 mm/memory.c:1728 exit_mmap+0x20d/0x970 mm/mmap.c:3250 __mmput+0x118/0x3a0 kernel/fork.c:1206 exit_mm+0x24d/0x350 kernel/exit.c:566 do_exit+0x958/0x2570 kernel/exit.c:868 do_group_exit+0x229/0x2e0 kernel/exit.c:1024 get_signal+0x1259/0x1340 kernel/signal.c:2872 arch_do_signal_or_restart+0xc4/0x1310 arch/x86/kernel/signal.c:871 exit_to_user_mode_loop+0x70/0x110 kernel/entry/common.c:174 exit_to_user_mode_prepare+0xee/0x180 kernel/entry/common.c:210 __syscall_exit_to_user_mode_work kernel/entry/common.c:292 [inline] syscall_exit_to_user_mode+0x16/0x40 kernel/entry/common.c:303 Memory state around the buggy address: ffff88805111af00: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ffff88805111af80: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff >ffff88805111b000: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ^ ffff88805111b080: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ffff88805111b100: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ==================================================================