================================================================== BUG: KASAN: use-after-free in ext4_read_inline_data fs/ext4/inline.c:210 [inline] BUG: KASAN: use-after-free in ext4_convert_inline_data_nolock+0x30e/0x9e0 fs/ext4/inline.c:1234 Read of size 68 at addr ffff888110229c80 by task syz-executor304/306 CPU: 1 PID: 306 Comm: syz-executor304 Not tainted syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026 Call Trace: __dump_stack+0x21/0x24 lib/dump_stack.c:88 dump_stack_lvl+0x110/0x170 lib/dump_stack.c:106 print_address_description+0x71/0x200 mm/kasan/report.c:316 print_report+0x4a/0x60 mm/kasan/report.c:420 kasan_report+0x122/0x150 mm/kasan/report.c:524 check_region_inline mm/kasan/generic.c:-1 [inline] kasan_check_range+0x249/0x2a0 mm/kasan/generic.c:189 memcpy+0x2d/0x70 mm/kasan/shadow.c:65 ext4_read_inline_data fs/ext4/inline.c:210 [inline] ext4_convert_inline_data_nolock+0x30e/0x9e0 fs/ext4/inline.c:1234 ext4_try_add_inline_entry+0x732/0xa60 fs/ext4/inline.c:1360 ext4_add_entry+0x509/0xda0 fs/ext4/namei.c:2458 ext4_mkdir+0x520/0xc90 fs/ext4/namei.c:3081 vfs_mkdir+0x39c/0x580 fs/namei.c:4113 do_mkdirat+0x174/0x4d0 fs/namei.c:4138 __do_sys_mkdir fs/namei.c:4158 [inline] __se_sys_mkdir fs/namei.c:4156 [inline] __x64_sys_mkdir+0x6e/0x80 fs/namei.c:4156 x64_sys_call+0x966/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:84 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: 0033:0x7f7cc7cf8a17 Code: 77 01 c3 48 c7 c2 d8 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 b8 53 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 01 c3 48 c7 c2 d8 ff ff ff f7 d8 64 89 02 b8 RSP: 002b:00007ffe515a3ec8 EFLAGS: 00000246 ORIG_RAX: 0000000000000053 RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f7cc7cf8a17 RDX: 000000000399446c RSI: 00000000000001ff RDI: 0000200000000080 RBP: 0000200000000140 R08: 0000000000000001 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000200000000080 R13: 00007ffe515a3f60 R14: 0000000000000000 R15: 0000000000000000 Allocated by task 98: kasan_save_stack mm/kasan/common.c:46 [inline] kasan_set_track+0x4b/0x70 mm/kasan/common.c:53 kasan_save_alloc_info+0x1f/0x30 mm/kasan/generic.c:505 __kasan_slab_alloc+0x72/0x80 mm/kasan/common.c:334 kasan_slab_alloc include/linux/kasan.h:202 [inline] slab_post_alloc_hook+0x4f/0x2d0 mm/slab.h:768 slab_alloc_node mm/slub.c:3382 [inline] slab_alloc mm/slub.c:3392 [inline] __kmem_cache_alloc_lru mm/slub.c:3399 [inline] kmem_cache_alloc+0x166/0x320 mm/slub.c:3408 vma_lock_alloc kernel/fork.c:471 [inline] vm_area_dup+0x65/0x280 kernel/fork.c:524 __split_vma+0x1c6/0x980 mm/mmap.c:2440 do_mas_align_munmap+0x314/0x1330 mm/mmap.c:2567 do_mas_munmap+0x23d/0x2b0 mm/mmap.c:2751 __mmap_region mm/mmap.c:2799 [inline] mmap_region+0x89e/0x2130 mm/mmap.c:3030 do_mmap+0x858/0xdd0 mm/mmap.c:1491 vm_mmap_pgoff+0x206/0x3f0 mm/util.c:525 ksys_mmap_pgoff+0x161/0x1d0 mm/mmap.c:1537 __do_sys_mmap arch/x86/kernel/sys_x86_64.c:93 [inline] __se_sys_mmap arch/x86/kernel/sys_x86_64.c:86 [inline] __x64_sys_mmap+0xfa/0x110 arch/x86/kernel/sys_x86_64.c:86 x64_sys_call+0x8fd/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:10 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 Freed by task 98: kasan_save_stack mm/kasan/common.c:46 [inline] kasan_set_track+0x4b/0x70 mm/kasan/common.c:53 kasan_save_free_info+0x2b/0x40 mm/kasan/generic.c:516 ____kasan_slab_free+0x132/0x180 mm/kasan/common.c:242 __kasan_slab_free+0x11/0x20 mm/kasan/common.c:250 kasan_slab_free include/linux/kasan.h:178 [inline] slab_free_hook mm/slub.c:1750 [inline] slab_free_freelist_hook+0xc2/0x190 mm/slub.c:1776 slab_free mm/slub.c:3712 [inline] kmem_cache_free+0x12d/0x300 mm/slub.c:3737 vma_lock_free kernel/fork.c:483 [inline] __vm_area_free+0x6f/0x130 kernel/fork.c:537 remove_vma mm/mmap.c:154 [inline] exit_mmap+0x5e2/0xc10 mm/mmap.c:3394 __mmput+0x92/0x340 kernel/fork.c:1319 mmput+0x4b/0x150 kernel/fork.c:1343 exit_mm kernel/exit.c:569 [inline] do_exit+0xa51/0x2850 kernel/exit.c:874 do_group_exit+0x21b/0x2e0 kernel/exit.c:1030 __do_sys_exit_group kernel/exit.c:1041 [inline] __se_sys_exit_group kernel/exit.c:1039 [inline] __x64_sys_exit_group+0x3f/0x40 kernel/exit.c:1039 x64_sys_call+0x7b4/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:232 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 The buggy address belongs to the object at ffff888110229c60 which belongs to the cache vma_lock of size 64 The buggy address is located 32 bytes inside of 64-byte region [ffff888110229c60, ffff888110229ca0) The buggy address belongs to the physical page: page:ffffea0004408a40 refcount:1 mapcount:0 mapping:0000000000000000 index:0xffff888110229000 pfn:0x110229 flags: 0x4000000000000200(slab|zone=1) raw: 4000000000000200 ffffea0004408748 ffff88810006c910 ffff8881001ea480 raw: ffff888110229000 00000000002a001e 00000001ffffffff 0000000000000000 page dumped because: kasan: bad access detected page_owner tracks the page as allocated page last allocated via order 0, migratetype Unmovable, gfp_mask 0x12cc0(GFP_KERNEL|__GFP_NOWARN|__GFP_NORETRY), pid 100, tgid 100 (logger), ts 5594533718, free_ts 5588509959 set_page_owner include/linux/page_owner.h:33 [inline] post_alloc_hook+0x1f5/0x210 mm/page_alloc.c:2672 prep_new_page+0x1c/0x110 mm/page_alloc.c:2679 get_page_from_freelist+0x2ca9/0x2d20 mm/page_alloc.c:4586 __alloc_pages+0x1fa/0x610 mm/page_alloc.c:5930 alloc_slab_page+0x6e/0xf0 include/linux/gfp.h:-1 allocate_slab mm/slub.c:1967 [inline] new_slab+0x98/0x3e0 mm/slub.c:2020 ___slab_alloc+0x70f/0xb70 mm/slub.c:3177 __slab_alloc+0x5e/0xa0 mm/slub.c:3263 slab_alloc_node mm/slub.c:3348 [inline] slab_alloc mm/slub.c:3392 [inline] __kmem_cache_alloc_lru mm/slub.c:3399 [inline] kmem_cache_alloc+0x1a8/0x320 mm/slub.c:3408 vma_lock_alloc kernel/fork.c:471 [inline] vm_area_dup+0x65/0x280 kernel/fork.c:524 __split_vma+0x1c6/0x980 mm/mmap.c:2440 do_mas_align_munmap+0x787/0x1330 mm/mmap.c:2588 do_mas_munmap+0x23d/0x2b0 mm/mmap.c:2751 __mmap_region mm/mmap.c:2799 [inline] mmap_region+0x89e/0x2130 mm/mmap.c:3030 do_mmap+0x858/0xdd0 mm/mmap.c:1491 vm_mmap_pgoff+0x206/0x3f0 mm/util.c:525 page last free stack trace: reset_page_owner include/linux/page_owner.h:26 [inline] free_pages_prepare mm/page_alloc.c:1580 [inline] free_pcp_prepare mm/page_alloc.c:1654 [inline] free_unref_page_prepare+0x80c/0x820 mm/page_alloc.c:3621 free_unref_page_list+0x117/0x8d0 mm/page_alloc.c:3772 release_pages+0xc7e/0xce0 mm/swap.c:1053 free_pages_and_swap_cache+0x86/0xa0 mm/swap_state.c:316 tlb_batch_pages_flush mm/mmu_gather.c:59 [inline] tlb_flush_mmu_free mm/mmu_gather.c:254 [inline] tlb_flush_mmu mm/mmu_gather.c:261 [inline] tlb_finish_mmu+0x1b2/0x380 mm/mmu_gather.c:361 exit_mmap+0x41d/0xc10 mm/mmap.c:3384 __mmput+0x92/0x340 kernel/fork.c:1319 mmput+0x4b/0x150 kernel/fork.c:1343 exec_mmap+0x3de/0x460 fs/exec.c:1045 begin_new_exec+0x1150/0x1cb0 fs/exec.c:1317 load_elf_binary+0x9e7/0x2820 fs/binfmt_elf.c:1028 search_binary_handler fs/exec.c:1768 [inline] exec_binprm fs/exec.c:1809 [inline] bprm_execve+0x782/0x1390 fs/exec.c:1878 do_execveat_common+0x8e3/0xaa0 fs/exec.c:1983 do_execve fs/exec.c:2057 [inline] __do_sys_execve fs/exec.c:2133 [inline] __se_sys_execve fs/exec.c:2128 [inline] __x64_sys_execve+0x92/0xb0 fs/exec.c:2128 x64_sys_call+0x98/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:60 do_syscall_x64 arch/x86/entry/common.c:46 [inline] do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:76 Memory state around the buggy address: ffff888110229b80: fc fc fc fc fa fb fb fb fb fb fb fb fc fc fc fc ffff888110229c00: fb fb fb fb fb fb fb fb fc fc fc fc fa fb fb fb >ffff888110229c80: fb fb fb fb fc fc fc fc fa fb fb fb fb fb fb fb ^ ffff888110229d00: fc fc fc fc fa fb fb fb fb fb fb fb fc fc fc fc ffff888110229d80: fa fb fb fb fb fb fb fb fc fc fc fc fb fb fb fb ================================================================== EXT4-fs error (device loop0): ext4_check_all_de:666: inode #12: block 7: comm syz-executor304: bad entry in directory: directory entry overrun - offset=0, inode=901261600, rec_len=7976, size=124 fake=0