EXT4-fs (loop0): mounted filesystem 00000000-0000-0000-0000-000000000000 r/w without journal. Quota mode: none.
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BUG: KASAN: use-after-free in ext4_search_dir+0x1b7/0x1d0 fs/ext4/namei.c:1539
Read of size 1 at addr ffff8880b99713ed by task syz-executor137/5026

CPU: 0 PID: 5026 Comm: syz-executor137 Not tainted 6.5.0-rc4-next-20230802-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2023
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0xd9/0x1b0 lib/dump_stack.c:106
 print_address_description mm/kasan/report.c:364 [inline]
 print_report+0xc4/0x620 mm/kasan/report.c:475
 kasan_report+0xda/0x110 mm/kasan/report.c:588
 ext4_search_dir+0x1b7/0x1d0 fs/ext4/namei.c:1539
 ext4_find_inline_entry+0x432/0x4f0 fs/ext4/inline.c:1694
 __ext4_find_entry+0x85e/0x1050 fs/ext4/namei.c:1612
 ext4_lookup_entry fs/ext4/namei.c:1767 [inline]
 ext4_lookup+0x543/0x740 fs/ext4/namei.c:1835
 lookup_open.isra.0+0x8dc/0x1360 fs/namei.c:3470
 open_last_lookups fs/namei.c:3560 [inline]
 path_openat+0x931/0x29c0 fs/namei.c:3790
 do_filp_open+0x1de/0x430 fs/namei.c:3820
 do_sys_openat2+0x176/0x1e0 fs/open.c:1422
 do_sys_open fs/open.c:1437 [inline]
 __do_sys_open fs/open.c:1445 [inline]
 __se_sys_open fs/open.c:1441 [inline]
 __x64_sys_open+0x154/0x1e0 fs/open.c:1441
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x38/0xb0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x63/0xcd
RIP: 0033:0x7f7514c41809
Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 d1 1a 00 00 90 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 b8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007ffd6d6b8e48 EFLAGS: 00000246 ORIG_RAX: 0000000000000002
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f7514c41809
RDX: 0000000000000000 RSI: 0000000000141042 RDI: 0000000020000100
RBP: 0000000000000000 R08: 000000000001f210 R09: 00007ffd6d6b8f40
R10: 000000000001f214 R11: 0000000000000246 R12: 00007ffd6d6b8f40
R13: 00007ffd6d6b9020 R14: 431bde82d7b634db R15: 00007f7514c8301d
 </TASK>

The buggy address belongs to the physical page:
page:ffffea0002e65c40 refcount:0 mapcount:0 mapping:0000000000000000 index:0x1 pfn:0xb9971
flags: 0xfff00000000000(node=0|zone=1|lastcpupid=0x7ff)
page_type: 0xffffffff()
raw: 00fff00000000000 ffffea000049ef48 ffffea0002ffda48 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 4882, tgid 4882 (sshd), ts 37355320029, free_ts 37379876114
 set_page_owner include/linux/page_owner.h:31 [inline]
 post_alloc_hook+0x2d2/0x350 mm/page_alloc.c:1569
 prep_new_page mm/page_alloc.c:1576 [inline]
 get_page_from_freelist+0x10d7/0x31b0 mm/page_alloc.c:3255
 __alloc_pages+0x1d0/0x4a0 mm/page_alloc.c:4511
 __folio_alloc+0x16/0x40 mm/page_alloc.c:4543
 vma_alloc_folio+0x156/0x890 mm/mempolicy.c:2253
 do_anonymous_page mm/memory.c:4259 [inline]
 do_pte_missing mm/memory.c:3816 [inline]
 handle_pte_fault mm/memory.c:5136 [inline]
 __handle_mm_fault+0x1051/0x3f90 mm/memory.c:5276
 handle_mm_fault+0x47a/0xa00 mm/memory.c:5441
 do_user_addr_fault+0x2e7/0xfe0 arch/x86/mm/fault.c:1342
 handle_page_fault arch/x86/mm/fault.c:1483 [inline]
 exc_page_fault+0x5c/0xd0 arch/x86/mm/fault.c:1539
 asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:570
page last free stack trace:
 reset_page_owner include/linux/page_owner.h:24 [inline]
 free_pages_prepare mm/page_alloc.c:1160 [inline]
 free_unref_page_prepare+0x508/0xb90 mm/page_alloc.c:2382
 free_unref_page_list+0xe6/0xb30 mm/page_alloc.c:2523
 release_pages+0x32a/0x14e0 mm/swap.c:1042
 tlb_batch_pages_flush+0x9a/0x190 mm/mmu_gather.c:97
 tlb_flush_mmu_free mm/mmu_gather.c:292 [inline]
 tlb_flush_mmu mm/mmu_gather.c:299 [inline]
 tlb_finish_mmu+0x14b/0x6f0 mm/mmu_gather.c:391
 unmap_region.constprop.0+0x2e6/0x3b0 mm/mmap.c:2312
 do_vmi_align_munmap+0xde3/0x15f0 mm/mmap.c:2546
 do_vmi_munmap+0x20e/0x450 mm/mmap.c:2614
 __vm_munmap+0x144/0x390 mm/mmap.c:2899
 __do_sys_munmap mm/mmap.c:2916 [inline]
 __se_sys_munmap mm/mmap.c:2913 [inline]
 __x64_sys_munmap+0x62/0x80 mm/mmap.c:2913
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x38/0xb0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x63/0xcd

Memory state around the buggy address:
 ffff8880b9971280: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
 ffff8880b9971300: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
>ffff8880b9971380: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
                                                          ^
 ffff8880b9971400: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
 ffff8880b9971480: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
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