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BUG: KASAN: use-after-free in ext4_xattr_delete_inode+0xc9a/0xca0 fs/ext4/xattr.c:2907
Read of size 4 at addr ffff88811a812000 by task syz-executor/462

CPU: 1 PID: 462 Comm: syz-executor Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/16/2026
Call Trace:
 <TASK>
 __dump_stack+0x21/0x30 lib/dump_stack.c:88
 dump_stack_lvl+0x110/0x170 lib/dump_stack.c:106
 print_address_description+0x7f/0x2c0 mm/kasan/report.c:248
 __kasan_report mm/kasan/report.c:427 [inline]
 kasan_report+0x10f/0x150 mm/kasan/report.c:444
 __asan_report_load4_noabort+0x14/0x20 mm/kasan/report_generic.c:308
 ext4_xattr_delete_inode+0xc9a/0xca0 fs/ext4/xattr.c:2907
 ext4_evict_inode+0xe0a/0x1420 fs/ext4/inode.c:302
 evict+0x4b6/0x8b0 fs/inode.c:650
 iput_final fs/inode.c:1779 [inline]
 iput+0x651/0x7e0 fs/inode.c:1805
 d_delete_notify include/linux/fsnotify.h:278 [inline]
 vfs_rmdir+0x329/0x450 fs/namei.c:4170
 do_rmdir+0x261/0x6b0 fs/namei.c:4218
 __do_sys_unlinkat fs/namei.c:4398 [inline]
 __se_sys_unlinkat fs/namei.c:4392 [inline]
 __x64_sys_unlinkat+0xc7/0xf0 fs/namei.c:4392
 x64_sys_call+0x4c0/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:264
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x66/0xd0
RIP: 0033:0x7fabea06d547
Code: 77 01 c3 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 b8 07 01 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:00007ffc1d938b78 EFLAGS: 00000207 ORIG_RAX: 0000000000000107
RAX: ffffffffffffffda RBX: 0000000000000065 RCX: 00007fabea06d547
RDX: 0000000000000200 RSI: 00007ffc1d939d20 RDI: 00000000ffffff9c
RBP: 00007fabea0f0a12 R08: 0000000000008670 R09: 00000000ffffffff
R10: 0000000000000100 R11: 0000000000000207 R12: 00007ffc1d939d20
R13: 00007fabea0f0a12 R14: 0000000000009908 R15: 00007ffc1d93bed0
 </TASK>

The buggy address belongs to the page:
page:ffffea00046a0480 refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x11a812
flags: 0x4000000000000000(zone=1)
raw: 4000000000000000 ffffea000469fc48 ffffea00046a0508 0000000000000000
raw: 0000000000000000 00000000000d0000 00000000ffffffff 0000000000000000
page dumped because: kasan: bad access detected
page_owner tracks the page as freed
page last allocated via order 0, migratetype Unmovable, gfp_mask 0x12cc0(GFP_KERNEL|__GFP_NOWARN|__GFP_NORETRY), pid 128, ts 6650735444, free_ts 39018203379
 set_page_owner include/linux/page_owner.h:33 [inline]
 post_alloc_hook+0x192/0x1b0 mm/page_alloc.c:2607
 prep_new_page+0x1c/0x110 mm/page_alloc.c:2613
 get_page_from_freelist+0x2c3a/0x2cd0 mm/page_alloc.c:4487
 __alloc_pages+0x1a2/0x460 mm/page_alloc.c:5824
 alloc_slab_page mm/slub.c:-1 [inline]
 allocate_slab mm/slub.c:1937 [inline]
 new_slab+0xa0/0x4d0 mm/slub.c:2000
 ___slab_alloc+0x3ac/0x840 mm/slub.c:3033
 __slab_alloc+0x49/0x90 mm/slub.c:3120
 slab_alloc_node mm/slub.c:3211 [inline]
 slab_alloc mm/slub.c:3255 [inline]
 kmem_cache_alloc+0x138/0x260 mm/slub.c:3260
 vm_area_dup+0x26/0x210 kernel/fork.c:371
 dup_mmap kernel/fork.c:605 [inline]
 dup_mm kernel/fork.c:1533 [inline]
 copy_mm+0x963/0x13a0 kernel/fork.c:1585
 copy_process+0x1130/0x3230 kernel/fork.c:2355
 kernel_clone+0x233/0x960 kernel/fork.c:2744
 __do_sys_clone kernel/fork.c:2870 [inline]
 __se_sys_clone kernel/fork.c:2854 [inline]
 __x64_sys_clone+0x198/0x210 kernel/fork.c:2854
 x64_sys_call+0x41f/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:57
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x66/0xd0
page last free stack trace:
 reset_page_owner include/linux/page_owner.h:26 [inline]
 free_pages_prepare mm/page_alloc.c:1474 [inline]
 free_pcp_prepare mm/page_alloc.c:1546 [inline]
 free_unref_page_prepare+0x5fa/0x600 mm/page_alloc.c:3536
 free_unref_page+0xae/0x540 mm/page_alloc.c:3618
 free_the_page mm/page_alloc.c:805 [inline]
 __free_pages+0x6c/0x100 mm/page_alloc.c:5900
 __free_slab+0xe5/0x1e0 mm/slub.c:2025
 free_slab mm/slub.c:2040 [inline]
 discard_slab mm/slub.c:2046 [inline]
 __unfreeze_partials+0x15a/0x190 mm/slub.c:2532
 put_cpu_partial+0xc6/0x120 mm/slub.c:2612
 __slab_free+0x1d4/0x290 mm/slub.c:3395
 do_slab_free mm/slub.c:3514 [inline]
 ___cache_free+0x104/0x120 mm/slub.c:3535
 qlink_free+0x4d/0x90 mm/kasan/quarantine.c:157
 qlist_free_all+0x5f/0xb0 mm/kasan/quarantine.c:176
 kasan_quarantine_reduce+0x14a/0x170 mm/kasan/quarantine.c:283
 __kasan_slab_alloc+0x2f/0xe0 mm/kasan/common.c:443
 kasan_slab_alloc include/linux/kasan.h:217 [inline]
 slab_post_alloc_hook+0x4f/0x2b0 mm/slab.h:550
 slab_alloc_node mm/slub.c:3245 [inline]
 slab_alloc mm/slub.c:3255 [inline]
 kmem_cache_alloc+0xf7/0x260 mm/slub.c:3260
 getname_flags+0xba/0x510 fs/namei.c:138
 getname+0x19/0x20 fs/namei.c:217

Memory state around the buggy address:
 ffff88811a811f00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff88811a811f80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>ffff88811a812000: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
                   ^
 ffff88811a812080: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
 ffff88811a812100: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
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