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BUG: KASAN: use-after-free in ext4_xattr_delete_inode+0xcd0/0xce0 fs/ext4/xattr.c:2910
Read of size 4 at addr ffff8881188d5000 by task syz-executor/468

CPU: 1 PID: 468 Comm: syz-executor Not tainted 5.15.167-syzkaller-1076100-g2e66050fb753 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/30/2024
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0x151/0x1c0 lib/dump_stack.c:106
 print_address_description+0x87/0x3b0 mm/kasan/report.c:248
 __kasan_report mm/kasan/report.c:427 [inline]
 kasan_report+0x179/0x1c0 mm/kasan/report.c:444
 __asan_report_load4_noabort+0x14/0x20 mm/kasan/report_generic.c:308
 ext4_xattr_delete_inode+0xcd0/0xce0 fs/ext4/xattr.c:2910
 ext4_evict_inode+0xea1/0x14e0 fs/ext4/inode.c:300
 evict+0x529/0x930 fs/inode.c:622
 iput_final fs/inode.c:1740 [inline]
 iput+0x63b/0x7e0 fs/inode.c:1766
 d_delete_notify include/linux/fsnotify.h:278 [inline]
 vfs_rmdir+0x359/0x470 fs/namei.c:4162
 do_rmdir+0x3ab/0x630 fs/namei.c:4210
 __do_sys_unlinkat fs/namei.c:4390 [inline]
 __se_sys_unlinkat fs/namei.c:4384 [inline]
 __x64_sys_unlinkat+0xdf/0xf0 fs/namei.c:4384
 x64_sys_call+0x6e9/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:264
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x3b/0xb0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x66/0xd0
RIP: 0033:0x7eff16ae8cf7
Code: 73 01 c3 48 c7 c1 a8 ff ff ff f7 d8 64 89 01 48 83 c8 ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 b8 07 01 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:00007ffed8b74ea8 EFLAGS: 00000207 ORIG_RAX: 0000000000000107
RAX: ffffffffffffffda RBX: 0000000000000065 RCX: 00007eff16ae8cf7
RDX: 0000000000000200 RSI: 00007ffed8b76050 RDI: 00000000ffffff9c
RBP: 00007eff16b5c1cc R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000100 R11: 0000000000000207 R12: 00007ffed8b76050
R13: 00007eff16b5c1cc R14: 000000000000d74a R15: 00007ffed8b78200
 </TASK>

Allocated by task 130:
 kasan_save_stack mm/kasan/common.c:38 [inline]
 kasan_set_track mm/kasan/common.c:45 [inline]
 set_alloc_info mm/kasan/common.c:433 [inline]
 __kasan_slab_alloc+0xb1/0xe0 mm/kasan/common.c:466
 kasan_slab_alloc include/linux/kasan.h:217 [inline]
 slab_post_alloc_hook+0x53/0x2c0 mm/slab.h:550
 slab_alloc_node mm/slub.c:3240 [inline]
 slab_alloc mm/slub.c:3248 [inline]
 kmem_cache_alloc+0xf5/0x200 mm/slub.c:3253
 anon_vma_chain_alloc mm/rmap.c:141 [inline]
 __anon_vma_prepare+0x56/0x430 mm/rmap.c:195
 do_anonymous_page mm/memory.c:4051 [inline]
 handle_pte_fault+0x202c/0x25c0 mm/memory.c:4891
 do_handle_mm_fault+0x20bc/0x2400 mm/memory.c:5315
 handle_mm_fault include/linux/mm.h:1836 [inline]
 do_user_addr_fault arch/x86/mm/fault.c:1418 [inline]
 handle_page_fault arch/x86/mm/fault.c:1509 [inline]
 exc_page_fault+0x3b5/0x7f0 arch/x86/mm/fault.c:1565
 asm_exc_page_fault+0x27/0x30 arch/x86/include/asm/idtentry.h:568

The buggy address belongs to the object at ffff8881188d5000
 which belongs to the cache anon_vma_chain of size 64
The buggy address is located 0 bytes inside of
 64-byte region [ffff8881188d5000, ffff8881188d5040)
The buggy address belongs to the page:
page:ffffea0004623540 refcount:1 mapcount:0 mapping:0000000000000000 index:0xffff8881188d5c60 pfn:0x1188d5
flags: 0x4000000000000200(slab|zone=1)
raw: 4000000000000200 ffffea00046231c0 0000000f0000000f ffff88810018ef00
raw: ffff8881188d5c60 00000000802a0000 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 129, ts 5680123893, free_ts 0
 set_page_owner include/linux/page_owner.h:33 [inline]
 post_alloc_hook+0x1a3/0x1b0 mm/page_alloc.c:2605
 prep_new_page+0x1b/0x110 mm/page_alloc.c:2611
 get_page_from_freelist+0x3550/0x35d0 mm/page_alloc.c:4485
 __alloc_pages+0x27e/0x8f0 mm/page_alloc.c:5779
 allocate_slab mm/slub.c:1932 [inline]
 new_slab+0x9a/0x4e0 mm/slub.c:1995
 ___slab_alloc+0x39e/0x830 mm/slub.c:3028
 __slab_alloc+0x4a/0x90 mm/slub.c:3115
 slab_alloc_node mm/slub.c:3206 [inline]
 slab_alloc mm/slub.c:3248 [inline]
 kmem_cache_alloc+0x134/0x200 mm/slub.c:3253
 anon_vma_chain_alloc mm/rmap.c:141 [inline]
 __anon_vma_prepare+0x56/0x430 mm/rmap.c:195
 do_anonymous_page mm/memory.c:4051 [inline]
 handle_pte_fault+0x202c/0x25c0 mm/memory.c:4891
 do_handle_mm_fault+0x20bc/0x2400 mm/memory.c:5315
 handle_mm_fault include/linux/mm.h:1836 [inline]
 do_user_addr_fault arch/x86/mm/fault.c:1418 [inline]
 handle_page_fault arch/x86/mm/fault.c:1509 [inline]
 exc_page_fault+0x3b5/0x7f0 arch/x86/mm/fault.c:1565
 asm_exc_page_fault+0x27/0x30 arch/x86/include/asm/idtentry.h:568
page_owner free stack trace missing

Memory state around the buggy address:
 ffff8881188d4f00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff8881188d4f80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>ffff8881188d5000: fb fb fb fb fb fb fb fb fc fc fc fc fb fb fb fb
                   ^
 ffff8881188d5080: fb fb fb fb fc fc fc fc fb fb fb fb fb fb fb fb
 ffff8881188d5100: fc fc fc fc fb fb fb fb fb fb fb fb fc fc fc fc
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