EXT4-fs error (device loop2): ext4_xattr_ibody_find:2210: inode #15: comm syz.2.18: corrupted in-inode xattr
EXT4-fs error (device loop2): ext4_orphan_get:1400: comm syz.2.18: couldn't read orphan inode 15 (err -117)
EXT4-fs (loop2): mounted filesystem without journal. Opts: jqfmt=vfsold,max_batch_time=0x0000000000000001,debug,noload,nombcache,noblock_validity,init_itable=0x0000000000000601,inode_readahead_blks=0x0000000000008000,,errors=continue
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BUG: KASAN: use-after-free in ext4_insert_dentry+0x392/0x710 fs/ext4/namei.c:2119
Write of size 248 at addr ffff88812a4e2f28 by task syz.2.18/537

CPU: 1 PID: 537 Comm: syz.2.18 Not tainted 5.10.236-syzkaller-1007360-gba8b8b193394 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025
Call Trace:
 __dump_stack lib/dump_stack.c:77 [inline]
 dump_stack_lvl+0x1e2/0x24b lib/dump_stack.c:118
 print_address_description+0x81/0x3b0 mm/kasan/report.c:248
 __kasan_report mm/kasan/report.c:435 [inline]
 kasan_report+0x179/0x1c0 mm/kasan/report.c:452
 check_region_inline mm/kasan/generic.c:-1 [inline]
 kasan_check_range+0x293/0x2a0 mm/kasan/generic.c:189
 memcpy+0x44/0x70 mm/kasan/shadow.c:66
 ext4_insert_dentry+0x392/0x710 fs/ext4/namei.c:2119
 add_dirent_to_buf+0x3ac/0x780 fs/ext4/namei.c:2163
 make_indexed_dir+0xe9f/0x1500 fs/ext4/namei.c:2354
 ext4_add_entry+0xdcf/0x1280 fs/ext4/namei.c:2460
 ext4_add_nondir+0x97/0x270 fs/ext4/namei.c:2786
 ext4_create+0x348/0x530 fs/ext4/namei.c:2831
 lookup_open fs/namei.c:3247 [inline]
 open_last_lookups fs/namei.c:3317 [inline]
 path_openat+0x1377/0x3000 fs/namei.c:3506
 do_filp_open+0x21c/0x460 fs/namei.c:3536
 do_sys_openat2+0x13f/0x710 fs/open.c:1217
 do_sys_open fs/open.c:1233 [inline]
 __do_sys_creat fs/open.c:1309 [inline]
 __se_sys_creat fs/open.c:1303 [inline]
 __x64_sys_creat+0x11f/0x160 fs/open.c:1303
 do_syscall_64+0x31/0x40 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x61/0xcb
RIP: 0033:0x7f1c89a0f169
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 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:00007f1c89481038 EFLAGS: 00000246 ORIG_RAX: 0000000000000055
RAX: ffffffffffffffda RBX: 00007f1c89c27fa0 RCX: 00007f1c89a0f169
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000200000000300
RBP: 00007f1c89a902a0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007f1c89c27fa0 R15: 00007ffc86f923e8

The buggy address belongs to the page:
page:ffffea0004a93880 refcount:3 mapcount:0 mapping:ffff88810919dc10 index:0x3f pfn:0x12a4e2
aops:def_blk_aops ino:0
flags: 0x400000000000202a(referenced|dirty|active|private)
raw: 400000000000202a dead000000000100 dead000000000122 ffff88810919dc10
raw: 000000000000003f ffff888128b31a80 00000003ffffffff ffff888111440000
page dumped because: kasan: bad access detected
page->mem_cgroup:ffff888111440000
page_owner tracks the page as allocated
page last allocated via order 0, migratetype Movable, gfp_mask 0x108c48(GFP_NOFS|__GFP_NOFAIL|__GFP_HARDWALL|__GFP_MOVABLE), pid 537, ts 55794039848, free_ts 55647267014
 set_page_owner include/linux/page_owner.h:35 [inline]
 post_alloc_hook mm/page_alloc.c:2456 [inline]
 prep_new_page+0x166/0x180 mm/page_alloc.c:2462
 get_page_from_freelist+0x2d8c/0x2f30 mm/page_alloc.c:4254
 __alloc_pages_nodemask+0x435/0xaf0 mm/page_alloc.c:5349
 __alloc_pages include/linux/gfp.h:544 [inline]
 __alloc_pages_node include/linux/gfp.h:557 [inline]
 alloc_pages_node include/linux/gfp.h:571 [inline]
 alloc_pages include/linux/gfp.h:590 [inline]
 __page_cache_alloc include/linux/pagemap.h:290 [inline]
 pagecache_get_page+0x669/0x950 mm/filemap.c:1848
 find_or_create_page include/linux/pagemap.h:402 [inline]
 grow_dev_page fs/buffer.c:976 [inline]
 grow_buffers fs/buffer.c:1045 [inline]
 __getblk_slow fs/buffer.c:1072 [inline]
 __getblk_gfp+0x221/0x7e0 fs/buffer.c:1370
 sb_getblk include/linux/buffer_head.h:361 [inline]
 ext4_getblk+0x259/0x660 fs/ext4/inode.c:877
 ext4_bread+0x2f/0x1b0 fs/ext4/inode.c:922
 ext4_append+0x29a/0x4d0 fs/ext4/namei.c:83
 make_indexed_dir+0x505/0x1500 fs/ext4/namei.c:2280
 ext4_add_entry+0xdcf/0x1280 fs/ext4/namei.c:2460
 ext4_add_nondir+0x97/0x270 fs/ext4/namei.c:2786
 ext4_create+0x348/0x530 fs/ext4/namei.c:2831
 lookup_open fs/namei.c:3247 [inline]
 open_last_lookups fs/namei.c:3317 [inline]
 path_openat+0x1377/0x3000 fs/namei.c:3506
 do_filp_open+0x21c/0x460 fs/namei.c:3536
 do_sys_openat2+0x13f/0x710 fs/open.c:1217
 do_sys_open fs/open.c:1233 [inline]
 __do_sys_creat fs/open.c:1309 [inline]
 __se_sys_creat fs/open.c:1303 [inline]
 __x64_sys_creat+0x11f/0x160 fs/open.c:1303
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+0x2ae/0x2d0 mm/page_alloc.c:3336
 free_unref_page_list+0x122/0xb20 mm/page_alloc.c:3443
 release_pages+0xea0/0xef0 mm/swap.c:1103
 __pagevec_release+0x84/0x100 mm/swap.c:1123
 pagevec_release include/linux/pagevec.h:88 [inline]
 shmem_undo_range+0x7d1/0x1a60 mm/shmem.c:965
 shmem_truncate_range mm/shmem.c:1069 [inline]
 shmem_evict_inode+0x215/0x9d0 mm/shmem.c:1169
 evict+0x526/0x9c0 fs/inode.c:612
 iput_final fs/inode.c:1736 [inline]
 iput+0x632/0x7e0 fs/inode.c:1762
 dentry_unlink_inode+0x2ea/0x3d0 fs/dcache.c:378
 __dentry_kill+0x447/0x650 fs/dcache.c:583
 dentry_kill+0xc0/0x2a0 fs/dcache.c:-1
 dput+0x40/0x80 fs/dcache.c:883
 __fput+0x52e/0x7b0 fs/file_table.c:294
 ____fput+0x15/0x20 fs/file_table.c:314
 task_work_run+0x129/0x190 kernel/task_work.c:189
 tracehook_notify_resume include/linux/tracehook.h:188 [inline]
 exit_to_user_mode_loop+0xbf/0xd0 kernel/entry/common.c:172

Memory state around the buggy address:
 ffff88812a4e2f00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff88812a4e2f80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>ffff88812a4e3000: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
                   ^
 ffff88812a4e3080: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
 ffff88812a4e3100: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
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