EXT4-fs error (device loop2): ext4_xattr_ibody_find:2219: inode #15: comm syz.2.15: corrupted in-inode xattr
EXT4-fs error (device loop2): ext4_orphan_get:1406: comm syz.2.15: couldn't read orphan inode 15 (err -117)
EXT4-fs (loop2): mounted filesystem without journal. Opts: ,errors=continue. Quota mode: none.
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BUG: KASAN: use-after-free in ext4_insert_dentry+0x3a0/0x720 fs/ext4/namei.c:2155
Write of size 251 at addr ffff88812b690f14 by task syz.2.15/470

CPU: 1 PID: 470 Comm: syz.2.15 Not tainted 5.15.180-syzkaller-1080043-g88c4075c39ed #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/19/2025
Call Trace:
 <TASK>
 __dump_stack+0x21/0x30 lib/dump_stack.c:88
 dump_stack_lvl+0xee/0x150 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+0xf1/0x140 mm/kasan/report.c:444
 check_region_inline mm/kasan/generic.c:-1 [inline]
 kasan_check_range+0x280/0x290 mm/kasan/generic.c:189
 memcpy+0x44/0x70 mm/kasan/shadow.c:66
 ext4_insert_dentry+0x3a0/0x720 fs/ext4/namei.c:2155
 add_dirent_to_buf+0x37d/0x780 fs/ext4/namei.c:2200
 make_indexed_dir+0xe50/0x14a0 fs/ext4/namei.c:2398
 ext4_add_entry+0xc24/0xf40 fs/ext4/namei.c:2504
 ext4_add_nondir+0x97/0x270 fs/ext4/namei.c:2845
 ext4_symlink+0x835/0xc90 fs/ext4/namei.c:3498
 vfs_symlink+0x29e/0x470 fs/namei.c:4429
 do_symlinkat+0x124/0x5a0 fs/namei.c:4458
 __do_sys_symlink fs/namei.c:4480 [inline]
 __se_sys_symlink fs/namei.c:4478 [inline]
 __x64_sys_symlink+0x7e/0x90 fs/namei.c:4478
 x64_sys_call+0x759/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:89
 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: 0033:0x7f1b9de17719
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:00007f1b9d898038 EFLAGS: 00000246 ORIG_RAX: 0000000000000058
RAX: ffffffffffffffda RBX: 00007f1b9dfcef80 RCX: 00007f1b9de17719
RDX: 0000000000000000 RSI: 0000000020000cc0 RDI: 0000000020000dc0
RBP: 00007f1b9de8a32e R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007f1b9dfcef80 R15: 00007fff4625f068
 </TASK>

The buggy address belongs to the page:
page:ffffea0004ada400 refcount:3 mapcount:0 mapping:ffff888109317258 index:0x3f pfn:0x12b690
memcg:ffff888124e74000
aops:def_blk_aops ino:700002
flags: 0x400000000000202a(referenced|dirty|active|private|zone=1)
raw: 400000000000202a 0000000000000000 dead000000000122 ffff888109317258
raw: 000000000000003f ffff888122efdf18 00000003ffffffff ffff888124e74000
page dumped because: kasan: bad access detected
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 470, ts 50841289763, free_ts 48972640537
 set_page_owner include/linux/page_owner.h:33 [inline]
 post_alloc_hook+0x192/0x1b0 mm/page_alloc.c:2605
 prep_new_page+0x1c/0x110 mm/page_alloc.c:2611
 get_page_from_freelist+0x2cc5/0x2d50 mm/page_alloc.c:4485
 __alloc_pages+0x18f/0x440 mm/page_alloc.c:5781
 __alloc_pages_node include/linux/gfp.h:591 [inline]
 alloc_pages_node include/linux/gfp.h:605 [inline]
 alloc_pages include/linux/gfp.h:618 [inline]
 __page_cache_alloc include/linux/pagemap.h:305 [inline]
 pagecache_get_page+0x8c7/0xc20 mm/filemap.c:1946
 find_or_create_page include/linux/pagemap.h:418 [inline]
 grow_dev_page fs/buffer.c:949 [inline]
 grow_buffers fs/buffer.c:1014 [inline]
 __getblk_slow fs/buffer.c:1041 [inline]
 __getblk_gfp+0x238/0x7d0 fs/buffer.c:1336
 sb_getblk include/linux/buffer_head.h:361 [inline]
 ext4_getblk+0x210/0x630 fs/ext4/inode.c:877
 ext4_bread+0x2b/0x180 fs/ext4/inode.c:923
 ext4_append+0x2c3/0x560 fs/ext4/namei.c:83
 make_indexed_dir+0x556/0x14a0 fs/ext4/namei.c:2318
 ext4_add_entry+0xc24/0xf40 fs/ext4/namei.c:2504
 ext4_add_nondir+0x97/0x270 fs/ext4/namei.c:2845
 ext4_symlink+0x835/0xc90 fs/ext4/namei.c:3498
 vfs_symlink+0x29e/0x470 fs/namei.c:4429
 do_symlinkat+0x124/0x5a0 fs/namei.c:4458
 __do_sys_symlink fs/namei.c:4480 [inline]
 __se_sys_symlink fs/namei.c:4478 [inline]
 __x64_sys_symlink+0x7e/0x90 fs/namei.c:4478
page last free stack trace:
 reset_page_owner include/linux/page_owner.h:26 [inline]
 free_pages_prepare mm/page_alloc.c:1472 [inline]
 free_pcp_prepare mm/page_alloc.c:1544 [inline]
 free_unref_page_prepare+0x542/0x550 mm/page_alloc.c:3534
 free_unref_page_list+0x134/0x9d0 mm/page_alloc.c:3671
 release_pages+0x1076/0x10d0 mm/swap.c:1009
 free_pages_and_swap_cache+0x86/0xa0 mm/swap_state.c:320
 tlb_batch_pages_flush mm/mmu_gather.c:49 [inline]
 tlb_flush_mmu_free mm/mmu_gather.c:240 [inline]
 tlb_flush_mmu mm/mmu_gather.c:247 [inline]
 tlb_finish_mmu+0x175/0x300 mm/mmu_gather.c:338
 unmap_region+0x315/0x360 mm/mmap.c:2680
 __do_munmap+0xa0e/0xfe0 mm/mmap.c:2913
 __vm_munmap+0x15b/0x2a0 mm/mmap.c:2966
 __do_sys_munmap mm/mmap.c:2992 [inline]
 __se_sys_munmap mm/mmap.c:2988 [inline]
 __x64_sys_munmap+0x6b/0x80 mm/mmap.c:2988
 x64_sys_call+0xc9/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:12
 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

Memory state around the buggy address:
 ffff88812b690f00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff88812b690f80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>ffff88812b691000: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
                   ^
 ffff88812b691080: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
 ffff88812b691100: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
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