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BUG: KASAN: use-after-free in ext4_search_dir+0xf7/0x1b0 fs/ext4/namei.c:1544
Read of size 1 at addr ffff88812a3ed900 by task syz-executor/293

CPU: 0 PID: 293 Comm: syz-executor Not tainted 5.15.167-syzkaller-android13-5.15.167_r00 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0x151/0x1c0 lib/dump_stack.c:106
 print_address_description+0x87/0x3b0 mm/kasan/report.c:248
 __kasan_report mm/kasan/report.c:427 [inline]
 kasan_report+0x179/0x1c0 mm/kasan/report.c:444
 __asan_report_load1_noabort+0x14/0x20 mm/kasan/report_generic.c:306
 ext4_search_dir+0xf7/0x1b0 fs/ext4/namei.c:1544
 ext4_find_inline_entry+0x4b6/0x5e0 fs/ext4/inline.c:1718
 __ext4_find_entry+0x2b0/0x1af0 fs/ext4/namei.c:1617
 ext4_find_entry+0x24f/0x3a0 fs/ext4/namei.c:1751
 ext4_rmdir+0x1b8/0xa80 fs/ext4/namei.c:3207
 vfs_rmdir+0x324/0x470 fs/namei.c:4149
 incfs_kill_sb+0x113/0x230 fs/incfs/vfs.c:1989
 deactivate_locked_super+0xad/0x110 fs/super.c:335
 deactivate_super+0xbe/0xf0 fs/super.c:366
 cleanup_mnt+0x45c/0x510 fs/namespace.c:1143
 __cleanup_mnt+0x19/0x20 fs/namespace.c:1150
 task_work_run+0x129/0x190 kernel/task_work.c:188
 exit_task_work include/linux/task_work.h:33 [inline]
 do_exit+0xc48/0x2ca0 kernel/exit.c:880
 do_group_exit+0x141/0x310 kernel/exit.c:1002
 __do_sys_exit_group kernel/exit.c:1013 [inline]
 __se_sys_exit_group kernel/exit.c:1011 [inline]
 __x64_sys_exit_group+0x3f/0x40 kernel/exit.c:1011
 x64_sys_call+0x610/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:232
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x3b/0xb0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x66/0xd0
RIP: 0033:0x7ff18db4e719
Code: Unable to access opcode bytes at RIP 0x7ff18db4e6ef.
RSP: 002b:00007ffee2a9f878 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7
RAX: ffffffffffffffda RBX: 00007ff18dbc1261 RCX: 00007ff18db4e719
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000001
RBP: 0000000000000075 R08: 00007ffee2a9d615 R09: 00007ffee2aa0b30
R10: 000000000000000b R11: 0000000000000246 R12: 00007ffee2aa0b30
R13: 00007ff18dbc123c R14: 0000000000028471 R15: 00007ffee2aa1bf0
 </TASK>

Allocated by task 1882:
 kasan_save_stack mm/kasan/common.c:38 [inline]
 kasan_set_track mm/kasan/common.c:45 [inline]
 set_alloc_info mm/kasan/common.c:433 [inline]
 __kasan_slab_alloc+0xb1/0xe0 mm/kasan/common.c:466
 kasan_slab_alloc include/linux/kasan.h:217 [inline]
 slab_post_alloc_hook+0x53/0x2c0 mm/slab.h:550
 slab_alloc_node mm/slub.c:3240 [inline]
 slab_alloc mm/slub.c:3248 [inline]
 kmem_cache_alloc+0xf5/0x200 mm/slub.c:3253
 fsnotify_attach_connector_to_object fs/notify/mark.c:531 [inline]
 fsnotify_add_mark_list fs/notify/mark.c:621 [inline]
 fsnotify_add_mark_locked+0x3cc/0x1670 fs/notify/mark.c:715
 fsnotify_add_inode_mark_locked include/linux/fsnotify_backend.h:550 [inline]
 inotify_new_watch fs/notify/inotify/inotify_user.c:601 [inline]
 inotify_update_watch fs/notify/inotify/inotify_user.c:628 [inline]
 __do_sys_inotify_add_watch fs/notify/inotify/inotify_user.c:785 [inline]
 __se_sys_inotify_add_watch+0x901/0xc20 fs/notify/inotify/inotify_user.c:709
 __x64_sys_inotify_add_watch+0x7b/0x90 fs/notify/inotify/inotify_user.c:709
 x64_sys_call+0x6aa/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:255
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x3b/0xb0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x66/0xd0

The buggy address belongs to the object at ffff88812a3ed900
 which belongs to the cache fsnotify_mark_connector of size 32
The buggy address is located 0 bytes inside of
 32-byte region [ffff88812a3ed900, ffff88812a3ed920)
The buggy address belongs to the page:
page:ffffea0004a8fb40 refcount:1 mapcount:0 mapping:0000000000000000 index:0xffff88812a3ed000 pfn:0x12a3ed
flags: 0x4000000000000200(slab|zone=1)
raw: 4000000000000200 ffffea0004311fc0 0000000200000002 ffff8881001cd500
raw: ffff88812a3ed000 0000000080550004 00000001ffffffff 0000000000000000
page dumped because: kasan: bad access detected
page_owner tracks the page as allocated
page last allocated via order 0, migratetype Unmovable, gfp_mask 0x112cc0(GFP_USER|__GFP_NOWARN|__GFP_NORETRY), pid 343, ts 33492353643, free_ts 26483606599
 set_page_owner include/linux/page_owner.h:33 [inline]
 post_alloc_hook+0x1a3/0x1b0 mm/page_alloc.c:2605
 prep_new_page+0x1b/0x110 mm/page_alloc.c:2611
 get_page_from_freelist+0x3550/0x35d0 mm/page_alloc.c:4485
 __alloc_pages+0x27e/0x8f0 mm/page_alloc.c:5779
 allocate_slab mm/slub.c:1932 [inline]
 new_slab+0x9a/0x4e0 mm/slub.c:1995
 ___slab_alloc+0x39e/0x830 mm/slub.c:3028
 __slab_alloc+0x4a/0x90 mm/slub.c:3115
 slab_alloc_node mm/slub.c:3206 [inline]
 slab_alloc mm/slub.c:3248 [inline]
 kmem_cache_alloc+0x134/0x200 mm/slub.c:3253
 fsnotify_attach_connector_to_object fs/notify/mark.c:531 [inline]
 fsnotify_add_mark_list fs/notify/mark.c:621 [inline]
 fsnotify_add_mark_locked+0x3cc/0x1670 fs/notify/mark.c:715
 fsnotify_add_inode_mark_locked include/linux/fsnotify_backend.h:550 [inline]
 inotify_new_watch fs/notify/inotify/inotify_user.c:601 [inline]
 inotify_update_watch fs/notify/inotify/inotify_user.c:628 [inline]
 __do_sys_inotify_add_watch fs/notify/inotify/inotify_user.c:785 [inline]
 __se_sys_inotify_add_watch+0x901/0xc20 fs/notify/inotify/inotify_user.c:709
 __x64_sys_inotify_add_watch+0x7b/0x90 fs/notify/inotify/inotify_user.c:709
 x64_sys_call+0x6aa/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:255
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x3b/0xb0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x66/0xd0
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+0x7c8/0x7d0 mm/page_alloc.c:3534
 free_unref_page+0xe8/0x750 mm/page_alloc.c:3616
 free_the_page mm/page_alloc.c:805 [inline]
 __free_pages+0x61/0xf0 mm/page_alloc.c:5855
 __vunmap+0x7bc/0x8f0 mm/vmalloc.c:2652
 __vfree mm/vmalloc.c:2700 [inline]
 vfree+0x7f/0xb0 mm/vmalloc.c:2731
 kvfree+0x26/0x40 mm/util.c:662
 translate_table+0x1020/0x21e0 net/ipv4/netfilter/arp_tables.c:595
 do_replace net/ipv4/netfilter/arp_tables.c:984 [inline]
 do_arpt_set_ctl+0xfbd/0x15c0 net/ipv4/netfilter/arp_tables.c:1428
 nf_setsockopt+0x274/0x2a0 net/netfilter/nf_sockopt.c:101
 ip_setsockopt+0x2ae7/0x4730 net/ipv4/ip_sockglue.c:1442
 tcp_setsockopt+0x22d/0x3800 net/ipv4/tcp.c:3706
 sock_common_setsockopt+0xa2/0xc0 net/core/sock.c:3459
 __sys_setsockopt+0x4dc/0x840 net/socket.c:2198
 __do_sys_setsockopt net/socket.c:2209 [inline]
 __se_sys_setsockopt net/socket.c:2206 [inline]
 __x64_sys_setsockopt+0xbf/0xd0 net/socket.c:2206
 x64_sys_call+0x1a2/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:55
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x3b/0xb0 arch/x86/entry/common.c:80

Memory state around the buggy address:
 ffff88812a3ed800: fc fc fb fb fb fb fc fc fb fb fb fb fc fc fb fb
 ffff88812a3ed880: fb fb fc fc fb fb fb fb fc fc fb fb fb fb fc fc
>ffff88812a3ed900: fb fb fb fb fc fc fb fb fb fb fc fc fb fb fb fb
                   ^
 ffff88812a3ed980: fc fc fa fb fb fb fc fc fb fb fb fb fc fc fb fb
 ffff88812a3eda00: fb fb fc fc fb fb fb fb fc fc fb fb fb fb fc fc
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