EXT4-fs error (device loop2): ext4_xattr_ibody_find:2186: inode #15: comm syz.2.17: corrupted in-inode xattr
EXT4-fs error (device loop2): ext4_orphan_get:1405: comm syz.2.17: couldn't read orphan inode 15 (err -117)
EXT4-fs (loop2): mounted filesystem without journal. Quota mode: none.
EXT4-fs warning (device loop2): dx_probe:833: inode #2: comm syz.2.17: Unrecognised inode hash code 4
EXT4-fs warning (device loop2): dx_probe:966: inode #2: comm syz.2.17: Corrupt directory, running e2fsck is recommended
==================================================================
BUG: KASAN: use-after-free in __ext4_check_dir_entry+0x700/0x880 fs/ext4/dir.c:85
Read of size 2 at addr ffff888125ee4003 by task syz.2.17/573

CPU: 1 PID: 573 Comm: syz.2.17 Not tainted 6.1.129-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0x151/0x1b7 lib/dump_stack.c:106
 print_address_description mm/kasan/report.c:316 [inline]
 print_report+0x158/0x4e0 mm/kasan/report.c:427
 kasan_report+0x13c/0x170 mm/kasan/report.c:531
 __asan_report_load2_noabort+0x14/0x20 mm/kasan/report_generic.c:349
 __ext4_check_dir_entry+0x700/0x880 fs/ext4/dir.c:85
 ext4_readdir+0x1290/0x3860 fs/ext4/dir.c:258
 iterate_dir+0x265/0x600 fs/readdir.c:-1
 __do_sys_getdents64 fs/readdir.c:369 [inline]
 __se_sys_getdents64+0x1c1/0x460 fs/readdir.c:354
 __x64_sys_getdents64+0x7b/0x90 fs/readdir.c:354
 x64_sys_call+0x5ae/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:218
 do_syscall_x64 arch/x86/entry/common.c:51 [inline]
 do_syscall_64+0x3b/0xb0 arch/x86/entry/common.c:81
 entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7f784a58d169
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:00007f784b365038 EFLAGS: 00000246 ORIG_RAX: 00000000000000d9
RAX: ffffffffffffffda RBX: 00007f784a7a5fa0 RCX: 00007f784a58d169
RDX: 0000000000000010 RSI: 0000000000000000 RDI: 0000000000000005
RBP: 00007f784a60e2a0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007f784a7a5fa0 R15: 00007fffe605a5f8
 </TASK>

The buggy address belongs to the physical page:
page:ffffea000497b900 refcount:0 mapcount:0 mapping:0000000000000000 index:0x1 pfn:0x125ee4
flags: 0x4000000000000000(zone=1)
raw: 4000000000000000 ffffea000497b948 ffff8881f713c128 0000000000000000
raw: 0000000000000001 0000000000000000 00000000ffffffff 0000000000000000
page dumped because: kasan: bad access detected
page_owner tracks the page as freed
page last allocated via order 0, migratetype Movable, gfp_mask 0x140dca(GFP_HIGHUSER_MOVABLE|__GFP_COMP|__GFP_ZERO), pid 573, tgid 572 (syz.2.17), ts 53528040480, free_ts 53529951786
 set_page_owner include/linux/page_owner.h:31 [inline]
 post_alloc_hook+0x1e2/0x1f0 mm/page_alloc.c:2532
 prep_new_page mm/page_alloc.c:2539 [inline]
 get_page_from_freelist+0x33e8/0x34b0 mm/page_alloc.c:4328
 __alloc_pages+0x3c2/0x7d0 mm/page_alloc.c:5605
 __folio_alloc+0x15/0x40 mm/page_alloc.c:5637
 __folio_alloc_node include/linux/gfp.h:246 [inline]
 folio_alloc include/linux/gfp.h:275 [inline]
 alloc_page_vma include/linux/gfp.h:284 [inline]
 wp_page_copy+0x20c/0x1610 mm/memory.c:3146
 do_wp_page+0xb17/0xcb0 mm/memory.c:-1
 handle_pte_fault mm/memory.c:5047 [inline]
 __handle_mm_fault mm/memory.c:5171 [inline]
 handle_mm_fault+0x147d/0x2c70 mm/memory.c:5292
 do_user_addr_fault arch/x86/mm/fault.c:1340 [inline]
 handle_page_fault arch/x86/mm/fault.c:1431 [inline]
 exc_page_fault+0x22e/0x540 arch/x86/mm/fault.c:1487
 asm_exc_page_fault+0x27/0x30 arch/x86/include/asm/idtentry.h:608
page last free stack trace:
 reset_page_owner include/linux/page_owner.h:24 [inline]
 free_pages_prepare mm/page_alloc.c:1459 [inline]
 free_pcp_prepare mm/page_alloc.c:1532 [inline]
 free_unref_page_prepare+0x9f1/0xa00 mm/page_alloc.c:3384
 free_unref_page_list+0xf1/0x7b0 mm/page_alloc.c:3525
 release_pages+0xef9/0xf50 mm/swap.c:1035
 free_pages_and_swap_cache+0x8a/0xa0 mm/swap_state.c:314
 tlb_batch_pages_flush mm/mmu_gather.c:59 [inline]
 tlb_flush_mmu_free mm/mmu_gather.c:254 [inline]
 tlb_flush_mmu mm/mmu_gather.c:261 [inline]
 tlb_finish_mmu+0x1e0/0x3f0 mm/mmu_gather.c:361
 unmap_region+0x29f/0x2f0 mm/mmap.c:2331
 do_mas_align_munmap+0x8d8/0x1090 mm/mmap.c:2580
 do_mas_munmap+0x23e/0x2b0 mm/mmap.c:2638
 __vm_munmap+0x265/0x370 mm/mmap.c:2924
 __do_sys_munmap mm/mmap.c:2949 [inline]
 __se_sys_munmap mm/mmap.c:2946 [inline]
 __x64_sys_munmap+0x60/0x70 mm/mmap.c:2946
 x64_sys_call+0x75/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:12
 do_syscall_x64 arch/x86/entry/common.c:51 [inline]
 do_syscall_64+0x3b/0xb0 arch/x86/entry/common.c:81
 entry_SYSCALL_64_after_hwframe+0x68/0xd2

Memory state around the buggy address:
 ffff888125ee3f00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff888125ee3f80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>ffff888125ee4000: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
                   ^
 ffff888125ee4080: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
 ffff888125ee4100: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
==================================================================
EXT4-fs error (device loop2): ext4_readdir:260: inode #2: block 255: comm syz.2.17: path (unknown): bad entry in directory: rec_len is smaller than minimal - offset=1023, inode=0, rec_len=0, size=1024 fake=0