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BUG: KASAN: use-after-free in ext4_xattr_delete_inode+0xbfd/0xc10 fs/ext4/xattr.c:2891
Read of size 4 at addr ffff888115f0d000 by task syz-executor/473

CPU: 0 PID: 473 Comm: syz-executor Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2026
Call Trace:
 __dump_stack+0x21/0x24 lib/dump_stack.c:77
 dump_stack_lvl+0x1a7/0x208 lib/dump_stack.c:118
 print_address_description+0x7f/0x2c0 mm/kasan/report.c:248
 __kasan_report mm/kasan/report.c:435 [inline]
 kasan_report+0xe2/0x130 mm/kasan/report.c:452
 __asan_report_load4_noabort+0x14/0x20 mm/kasan/report_generic.c:308
 ext4_xattr_delete_inode+0xbfd/0xc10 fs/ext4/xattr.c:2891
 ext4_evict_inode+0x10df/0x1770 fs/ext4/inode.c:300
 evict+0x4ae/0x930 fs/inode.c:612
 iput_final fs/inode.c:1736 [inline]
 iput+0x638/0x7c0 fs/inode.c:1762
 d_delete_notify include/linux/fsnotify.h:267 [inline]
 vfs_rmdir+0x2bd/0x3e0 fs/namei.c:3873
 do_rmdir+0x230/0x630 fs/namei.c:3920
 __do_sys_unlinkat fs/namei.c:4084 [inline]
 __se_sys_unlinkat fs/namei.c:4078 [inline]
 __x64_sys_unlinkat+0xc7/0xf0 fs/namei.c:4078
 do_syscall_64+0x31/0x40 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x61/0xcb
RIP: 0033:0x7f61f4745037
Code: 77 01 c3 48 c7 c2 d0 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 d0 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fff852d4f78 EFLAGS: 00000207 ORIG_RAX: 0000000000000107
RAX: ffffffffffffffda RBX: 0000000000000065 RCX: 00007f61f4745037
RDX: 0000000000000200 RSI: 00007fff852d6120 RDI: 00000000ffffff9c
RBP: 00007f61f47be58e R08: 0000000000008710 R09: 00000000ffffffff
R10: 0000000000000100 R11: 0000000000000207 R12: 00007fff852d6120
R13: 00007f61f47be58e R14: 000000000000a2e9 R15: 0000000000000000

Allocated by task 108:
 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:430 [inline]
 __kasan_slab_alloc+0xbd/0xf0 mm/kasan/common.c:463
 kasan_slab_alloc include/linux/kasan.h:244 [inline]
 slab_post_alloc_hook+0x5d/0x2f0 mm/slab.h:580
 slab_alloc_node mm/slub.c:2952 [inline]
 slab_alloc mm/slub.c:2960 [inline]
 kmem_cache_alloc+0x162/0x2d0 mm/slub.c:2965
 kmem_cache_zalloc include/linux/slab.h:657 [inline]
 lsm_file_alloc security/security.c:535 [inline]
 security_file_alloc+0x33/0x120 security/security.c:1444
 __alloc_file+0xb5/0x320 fs/file_table.c:106
 alloc_empty_file+0x97/0x180 fs/file_table.c:151
 path_openat+0xf5/0x31c0 fs/namei.c:3503
 do_filp_open+0x1e2/0x410 fs/namei.c:3544
 do_sys_openat2+0x19f/0x750 fs/open.c:1219
 do_sys_open fs/open.c:1235 [inline]
 __do_sys_openat fs/open.c:1251 [inline]
 __se_sys_openat fs/open.c:1246 [inline]
 __x64_sys_openat+0x136/0x160 fs/open.c:1246
 do_syscall_64+0x31/0x40 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x61/0xcb

The buggy address belongs to the object at ffff888115f0d000
 which belongs to the cache lsm_file_cache of size 16
The buggy address is located 0 bytes inside of
 16-byte region [ffff888115f0d000, ffff888115f0d010)
The buggy address belongs to the page:
page:ffffea000457c340 refcount:1 mapcount:0 mapping:0000000000000000 index:0xffff888115f0db80 pfn:0x115f0d
flags: 0x4000000000000200(slab)
raw: 4000000000000200 ffffea000451fc40 0000001a0000001a ffff888100189380
raw: ffff888115f0db80 0000000080800007 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 95, ts 4635555725, free_ts 0
 set_page_owner include/linux/page_owner.h:35 [inline]
 post_alloc_hook mm/page_alloc.c:2456 [inline]
 prep_new_page+0x179/0x180 mm/page_alloc.c:2462
 get_page_from_freelist+0x223b/0x23d0 mm/page_alloc.c:4254
 __alloc_pages_nodemask+0x290/0x620 mm/page_alloc.c:5384
 alloc_slab_page mm/slub.c:-1 [inline]
 allocate_slab mm/slub.c:1813 [inline]
 new_slab+0x84/0x3f0 mm/slub.c:1874
 new_slab_objects mm/slub.c:2632 [inline]
 ___slab_alloc+0x2a6/0x450 mm/slub.c:2796
 __slab_alloc+0x63/0xa0 mm/slub.c:2836
 slab_alloc_node mm/slub.c:2918 [inline]
 slab_alloc mm/slub.c:2960 [inline]
 kmem_cache_alloc+0x1ac/0x2d0 mm/slub.c:2965
 kmem_cache_zalloc include/linux/slab.h:657 [inline]
 lsm_file_alloc security/security.c:535 [inline]
 security_file_alloc+0x33/0x120 security/security.c:1444
 __alloc_file+0xb5/0x320 fs/file_table.c:106
 alloc_empty_file+0x97/0x180 fs/file_table.c:151
 path_openat+0xf5/0x31c0 fs/namei.c:3503
 do_filp_open+0x1e2/0x410 fs/namei.c:3544
 do_sys_openat2+0x19f/0x750 fs/open.c:1219
 do_sys_open fs/open.c:1235 [inline]
 __do_sys_openat fs/open.c:1251 [inline]
 __se_sys_openat fs/open.c:1246 [inline]
 __x64_sys_openat+0x136/0x160 fs/open.c:1246
 do_syscall_64+0x31/0x40 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x61/0xcb
page_owner free stack trace missing

Memory state around the buggy address:
 ffff888115f0cf00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff888115f0cf80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>ffff888115f0d000: fb fb fc fc fb fb fc fc fb fb fc fc fb fb fc fc
                   ^
 ffff888115f0d080: fb fb fc fc fb fb fc fc fb fb fc fc fb fb fc fc
 ffff888115f0d100: fb fb fc fc fb fb fc fc fb fb fc fc fb fb fc fc
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