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BUG: KASAN: use-after-free in nilfs_set_link+0x41d/0x4e0 fs/nilfs2/dir.c:421
Read of size 2 at addr ffff8881242ed008 by task syz-executor.2/8445

CPU: 1 PID: 8445 Comm: syz-executor.2 Not tainted 6.7.0-rc8-syzkaller-00177-g52b1853b080a #0
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.16.2-1 04/01/2014
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
 nilfs_set_link+0x41d/0x4e0 fs/nilfs2/dir.c:421
 nilfs_rename+0x4b7/0x580 fs/nilfs2/namei.c:414
 vfs_rename+0x13e0/0x1c30 fs/namei.c:4844
 do_renameat2+0xc3c/0xdc0 fs/namei.c:4996
 __do_sys_rename fs/namei.c:5042 [inline]
 __se_sys_rename fs/namei.c:5040 [inline]
 __x64_sys_rename+0x81/0xa0 fs/namei.c:5040
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0x40/0x110 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x63/0x6b
RIP: 0033:0x7fd8bd67cd29
Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 e1 20 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 b0 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fd8be3590c8 EFLAGS: 00000246 ORIG_RAX: 0000000000000052
RAX: ffffffffffffffda RBX: 00007fd8bd7abf80 RCX: 00007fd8bd67cd29
RDX: 0000000000000000 RSI: 0000000020000040 RDI: 0000000020000180
RBP: 00007fd8bd6c947a R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 000000000000000b R14: 00007fd8bd7abf80 R15: 00007ffeb6d1d858
 </TASK>

The buggy address belongs to the physical page:
page:ffffea000490bb40 refcount:0 mapcount:0 mapping:0000000000000000 index:0x1 pfn:0x1242ed
flags: 0x57ff00000000000(node=1|zone=2|lastcpupid=0x7ff)
page_type: 0xffffffff()
raw: 057ff00000000000 ffffea00047c6888 ffffea0004779348 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 0x140cca(GFP_HIGHUSER_MOVABLE|__GFP_COMP), pid 8457, tgid 8457 (modprobe), ts 241369380049, free_ts 241372641705
 set_page_owner include/linux/page_owner.h:31 [inline]
 post_alloc_hook+0x2d0/0x350 mm/page_alloc.c:1537
 prep_new_page mm/page_alloc.c:1544 [inline]
 get_page_from_freelist+0xa25/0x36d0 mm/page_alloc.c:3312
 __alloc_pages+0x22e/0x2420 mm/page_alloc.c:4568
 alloc_pages_mpol+0x258/0x5f0 mm/mempolicy.c:2133
 vma_alloc_folio+0xad/0x220 mm/mempolicy.c:2172
 wp_page_copy mm/memory.c:3120 [inline]
 do_wp_page+0xd8d/0x36b0 mm/memory.c:3511
 handle_pte_fault mm/memory.c:5055 [inline]
 __handle_mm_fault+0x1d7d/0x3d70 mm/memory.c:5180
 handle_mm_fault+0x47a/0xa10 mm/memory.c:5345
 do_user_addr_fault+0x30b/0x1030 arch/x86/mm/fault.c:1364
 handle_page_fault arch/x86/mm/fault.c:1507 [inline]
 exc_page_fault+0x5d/0xc0 arch/x86/mm/fault.c:1563
 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:1137 [inline]
 free_unref_page_prepare+0x4fa/0xaa0 mm/page_alloc.c:2347
 free_unref_page_list+0xe6/0xb40 mm/page_alloc.c:2533
 release_pages+0x32a/0x14f0 mm/swap.c:1042
 tlb_batch_pages_flush+0x9a/0x190 mm/mmu_gather.c:98
 tlb_flush_mmu_free mm/mmu_gather.c:293 [inline]
 tlb_flush_mmu mm/mmu_gather.c:300 [inline]
 tlb_finish_mmu+0x14b/0x6f0 mm/mmu_gather.c:392
 exit_mmap+0x38b/0xa70 mm/mmap.c:3324
 __mmput+0x12a/0x4d0 kernel/fork.c:1349
 mmput+0x62/0x70 kernel/fork.c:1371
 exit_mm kernel/exit.c:567 [inline]
 do_exit+0x9a5/0x2ad0 kernel/exit.c:856
 do_group_exit+0xd4/0x2a0 kernel/exit.c:1018
 __do_sys_exit_group kernel/exit.c:1029 [inline]
 __se_sys_exit_group kernel/exit.c:1027 [inline]
 __x64_sys_exit_group+0x3e/0x50 kernel/exit.c:1027
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0x40/0x110 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x63/0x6b

Memory state around the buggy address:
 ffff8881242ecf00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff8881242ecf80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>ffff8881242ed000: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
                      ^
 ffff8881242ed080: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
 ffff8881242ed100: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
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