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BUG: KASAN: slab-out-of-bounds in ext4_xattr_delete_inode+0xbe3/0xbf0 fs/ext4/xattr.c:2909
Read of size 4 at addr ffff888110339000 by task syz-executor/474

CPU: 1 PID: 474 Comm: syz-executor Not tainted 5.10.240-syzkaller-1008085-g1154f779f3f3 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025
Call Trace:
 __dump_stack+0x21/0x24 lib/dump_stack.c:77
 dump_stack_lvl+0x169/0x1d8 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+0xbe3/0xbf0 fs/ext4/xattr.c:2909
 ext4_evict_inode+0x106f/0x16e0 fs/ext4/inode.c:300
 evict+0x478/0x910 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:3865
 do_rmdir+0x218/0x620 fs/namei.c:3912
 __do_sys_unlinkat fs/namei.c:4076 [inline]
 __se_sys_unlinkat fs/namei.c:4070 [inline]
 __x64_sys_unlinkat+0xc7/0xf0 fs/namei.c:4070
 do_syscall_64+0x31/0x40 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x61/0xcb
RIP: 0033:0x7fe7029ba6c7
Code: 73 01 c3 48 c7 c1 b0 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 b0 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007ffc84f5b3e8 EFLAGS: 00000207 ORIG_RAX: 0000000000000107
RAX: ffffffffffffffda RBX: 0000000000000065 RCX: 00007fe7029ba6c7
RDX: 0000000000000200 RSI: 00007ffc84f5c590 RDI: 00000000ffffff9c
RBP: 00007fe702a06336 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000100 R11: 0000000000000207 R12: 00007ffc84f5c590
R13: 00007fe702a06336 R14: 000000000000bfa9 R15: 0000000000000007

Allocated by task 0:
(stack is not available)

The buggy address belongs to the object at ffff888110339000
 which belongs to the cache lsm_inode_cache of size 56
The buggy address is located 0 bytes inside of
 56-byte region [ffff888110339000, ffff888110339038)
The buggy address belongs to the page:
page:ffffea000440ce40 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x110339
flags: 0x4000000000000200(slab)
raw: 4000000000000200 dead000000000100 dead000000000122 ffff888100188c00
raw: 0000000000000000 00000000802e002e 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 0x112c40(GFP_NOFS|__GFP_NOWARN|__GFP_NORETRY|__GFP_HARDWALL), pid 431, ts 49147400344, free_ts 49146348029
 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+0x2235/0x23d0 mm/page_alloc.c:4254
 __alloc_pages_nodemask+0x268/0x5f0 mm/page_alloc.c:5357
 alloc_slab_page mm/slub.c:-1 [inline]
 allocate_slab mm/slub.c:1808 [inline]
 new_slab+0x84/0x3f0 mm/slub.c:1869
 new_slab_objects mm/slub.c:2627 [inline]
 ___slab_alloc+0x2a6/0x450 mm/slub.c:2791
 __slab_alloc+0x63/0xa0 mm/slub.c:2831
 slab_alloc_node mm/slub.c:2913 [inline]
 slab_alloc mm/slub.c:2955 [inline]
 kmem_cache_alloc+0x1af/0x2e0 mm/slub.c:2960
 kmem_cache_zalloc include/linux/slab.h:654 [inline]
 lsm_inode_alloc security/security.c:556 [inline]
 security_inode_alloc+0x33/0x110 security/security.c:952
 inode_init_always+0x70a/0x9b0 fs/inode.c:204
 alloc_inode fs/inode.c:240 [inline]
 new_inode_pseudo+0x91/0x210 fs/inode.c:968
 new_inode+0x28/0x1e0 fs/inode.c:997
 shmem_get_inode+0x34a/0x9d0 mm/shmem.c:2315
 shmem_mknod+0x5c/0x1c0 mm/shmem.c:2898
 shmem_create+0x2b/0x40 mm/shmem.c:2958
 lookup_open fs/namei.c:3247 [inline]
 open_last_lookups fs/namei.c:3317 [inline]
 path_openat+0x16e3/0x3160 fs/namei.c:3506
 do_filp_open+0x1b3/0x3e0 fs/namei.c:3536
page last free stack trace:
 reset_page_owner include/linux/page_owner.h:28 [inline]
 free_pages_prepare mm/page_alloc.c:1349 [inline]
 free_pcp_prepare mm/page_alloc.c:1421 [inline]
 free_unref_page_prepare+0x2b7/0x2d0 mm/page_alloc.c:3336
 free_unref_page_list+0x12e/0x9b0 mm/page_alloc.c:3443
 release_pages+0xe38/0xe80 mm/swap.c:1103
 __pagevec_release+0x71/0xe0 mm/swap.c:1123
 pagevec_release include/linux/pagevec.h:88 [inline]
 truncate_inode_pages_range+0x771/0x15b0 mm/truncate.c:367
 truncate_inode_pages+0x24/0x30 mm/truncate.c:473
 kill_bdev fs/block_dev.c:86 [inline]
 set_blocksize+0x34f/0x3c0 fs/block_dev.c:171
 sb_set_blocksize fs/block_dev.c:180 [inline]
 sb_min_blocksize+0xfc/0x1d0 fs/block_dev.c:196
 ext4_fill_super+0x64b/0x8b60 fs/ext4/super.c:4060
 mount_bdev+0x28b/0x3a0 fs/super.c:1442
 ext4_mount+0x34/0x40 fs/ext4/super.c:6662
 legacy_get_tree+0xed/0x190 fs/fs_context.c:593
 vfs_get_tree+0x89/0x260 fs/super.c:1572
 do_new_mount+0x25a/0xa20 fs/namespace.c:2919
 path_mount+0x572/0xc80 fs/namespace.c:3249
 do_mount fs/namespace.c:3262 [inline]
 __do_sys_mount fs/namespace.c:3470 [inline]
 __se_sys_mount+0x318/0x380 fs/namespace.c:3447

Memory state around the buggy address:
 ffff888110338f00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff888110338f80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>ffff888110339000: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
                   ^
 ffff888110339080: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
 ffff888110339100: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
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