EXT4-fs warning (device loop0): dx_probe:965: inode #2: comm syz.0.18: 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 ffff8881203e6003 by task syz.0.18/557

CPU: 1 PID: 557 Comm: syz.0.18 Not tainted 5.15.150-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/07/2024
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0x151/0x1b7 lib/dump_stack.c:106
 print_address_description+0x87/0x3a0 mm/kasan/report.c:248
 __kasan_report mm/kasan/report.c:434 [inline]
 kasan_report+0x177/0x1c0 mm/kasan/report.c:451
 __asan_report_load2_noabort+0x14/0x20 mm/kasan/report_generic.c:307
 __ext4_check_dir_entry+0x700/0x880 fs/ext4/dir.c:85
 ext4_readdir+0x1490/0x38d0 fs/ext4/dir.c:258
 iterate_dir+0x265/0x600
 __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
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x3d/0xb0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x61/0xcb
RIP: 0033:0x7f325b20cb29
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:00007f325ac96048 EFLAGS: 00000246 ORIG_RAX: 00000000000000d9
RAX: ffffffffffffffda RBX: 00007f325b39afa0 RCX: 00007f325b20cb29
RDX: 0000000000000010 RSI: 0000000000000000 RDI: 0000000000000005
RBP: 00007f325b28d756 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 000000000000000b R14: 00007f325b39afa0 R15: 00007fffb2585328
 </TASK>

The buggy address belongs to the page:
page:ffffea000480f980 refcount:0 mapcount:0 mapping:0000000000000000 index:0x1 pfn:0x1203e6
flags: 0x4000000000000000(zone=1)
raw: 4000000000000000 ffffea000480f9c8 ffffea00047f68c8 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 0x1100dca(GFP_HIGHUSER_MOVABLE|__GFP_ZERO), pid 526, ts 46900334446, free_ts 47256096047
 set_page_owner include/linux/page_owner.h:31 [inline]
 post_alloc_hook+0x15d/0x170 mm/page_alloc.c:2420
 prep_new_page mm/page_alloc.c:2426 [inline]
 get_page_from_freelist+0x33e6/0x34c0 mm/page_alloc.c:4159
 __alloc_pages+0x38a/0x7b0 mm/page_alloc.c:5421
 __alloc_pages_node include/linux/gfp.h:570 [inline]
 alloc_pages_node include/linux/gfp.h:584 [inline]
 alloc_pages include/linux/gfp.h:597 [inline]
 do_anonymous_page mm/memory.c:3808 [inline]
 handle_pte_fault mm/memory.c:4619 [inline]
 __handle_mm_fault mm/memory.c:4756 [inline]
 handle_mm_fault+0x2394/0x4350 mm/memory.c:4854
 do_user_addr_fault arch/x86/mm/fault.c:1397 [inline]
 handle_page_fault arch/x86/mm/fault.c:1485 [inline]
 exc_page_fault+0x23a/0x610 arch/x86/mm/fault.c:1541
 asm_exc_page_fault+0x27/0x30 arch/x86/include/asm/idtentry.h:568
page last free stack trace:
 reset_page_owner include/linux/page_owner.h:24 [inline]
 free_pages_prepare mm/page_alloc.c:1340 [inline]
 free_pcp_prepare mm/page_alloc.c:1413 [inline]
 free_unref_page_prepare+0x7a9/0x7e0 mm/page_alloc.c:3317
 free_unref_page_list+0x1aa/0x6d0 mm/page_alloc.c:3433
 release_pages+0xe33/0xe90 mm/swap.c:963
 free_pages_and_swap_cache+0x8a/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+0x177/0x320 mm/mmu_gather.c:338
 exit_mmap+0x3cd/0x610 mm/mmap.c:3188
 __mmput+0x95/0x300 kernel/fork.c:1126
 mmput+0x59/0x70 kernel/fork.c:1147
 exit_mm kernel/exit.c:548 [inline]
 do_exit+0xb6a/0x29e0 kernel/exit.c:859
 do_group_exit+0x141/0x310 kernel/exit.c:994
 get_signal+0x797/0x1620 kernel/signal.c:2889
 arch_do_signal_or_restart+0xbd/0x1680 arch/x86/kernel/signal.c:867
 handle_signal_work kernel/entry/common.c:148 [inline]
 exit_to_user_mode_loop+0xa0/0xe0 kernel/entry/common.c:172
 exit_to_user_mode_prepare+0x5a/0xa0 kernel/entry/common.c:208
 __syscall_exit_to_user_mode_work kernel/entry/common.c:290 [inline]
 syscall_exit_to_user_mode+0x26/0x160 kernel/entry/common.c:301
 do_syscall_64+0x49/0xb0 arch/x86/entry/common.c:86

Memory state around the buggy address:
 ffff8881203e5f00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff8881203e5f80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>ffff8881203e6000: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
                   ^
 ffff8881203e6080: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
 ffff8881203e6100: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
==================================================================
EXT4-fs error (device loop0): ext4_readdir:260: inode #2: block 255: comm syz.0.18: path /root/syzkaller.b5GJRh/3/file0: bad entry in directory: rec_len is smaller than minimal - offset=1023, inode=0, rec_len=0, size=1024 fake=0