==================================================================
BUG: KASAN: use-after-free in bin_search_in_dir_item fs/reiserfs/namei.c:40 [inline]
BUG: KASAN: use-after-free in search_by_entry_key+0x45c/0xe88 fs/reiserfs/namei.c:165
Read of size 4 at addr ffff00011fbb8394 by task syz-executor.5/9523

CPU: 0 PID: 9523 Comm: syz-executor.5 Not tainted 6.7.0-rc8-syzkaller-g0802e17d9aca #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 11/17/2023
Call trace:
 dump_backtrace+0x1b8/0x1e4 arch/arm64/kernel/stacktrace.c:291
 show_stack+0x2c/0x3c arch/arm64/kernel/stacktrace.c:298
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0xd0/0x124 lib/dump_stack.c:106
 print_address_description mm/kasan/report.c:364 [inline]
 print_report+0x174/0x514 mm/kasan/report.c:475
 kasan_report+0xd8/0x138 mm/kasan/report.c:588
 __asan_report_load_n_noabort+0x1c/0x28 mm/kasan/report_generic.c:391
 bin_search_in_dir_item fs/reiserfs/namei.c:40 [inline]
 search_by_entry_key+0x45c/0xe88 fs/reiserfs/namei.c:165
 reiserfs_find_entry+0x288/0x149c fs/reiserfs/namei.c:322
 reiserfs_lookup+0x17c/0x45c fs/reiserfs/namei.c:368
 __lookup_slow+0x250/0x374 fs/namei.c:1694
 lookup_one_len+0x178/0x28c fs/namei.c:2746
 reiserfs_lookup_privroot+0x8c/0x184 fs/reiserfs/xattr.c:977
 reiserfs_fill_super+0x1bc0/0x2028 fs/reiserfs/super.c:2174
 mount_bdev+0x1e8/0x2b4 fs/super.c:1650
 get_super_block+0x44/0x58 fs/reiserfs/super.c:2601
 legacy_get_tree+0xd4/0x16c fs/fs_context.c:662
 vfs_get_tree+0x90/0x288 fs/super.c:1771
 do_new_mount+0x25c/0x8c8 fs/namespace.c:3337
 path_mount+0x590/0xe04 fs/namespace.c:3664
 do_mount fs/namespace.c:3677 [inline]
 __do_sys_mount fs/namespace.c:3886 [inline]
 __se_sys_mount fs/namespace.c:3863 [inline]
 __arm64_sys_mount+0x45c/0x594 fs/namespace.c:3863
 __invoke_syscall arch/arm64/kernel/syscall.c:37 [inline]
 invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:51
 el0_svc_common+0x130/0x23c arch/arm64/kernel/syscall.c:136
 do_el0_svc+0x48/0x58 arch/arm64/kernel/syscall.c:155
 el0_svc+0x54/0x158 arch/arm64/kernel/entry-common.c:678
 el0t_64_sync_handler+0x84/0xfc arch/arm64/kernel/entry-common.c:696
 el0t_64_sync+0x190/0x194 arch/arm64/kernel/entry.S:595

The buggy address belongs to the physical page:
page:00000000a99b7f01 refcount:0 mapcount:0 mapping:0000000000000000 index:0x1 pfn:0x15fbb8
flags: 0x5ffc00000000000(node=0|zone=2|lastcpupid=0x7ff)
page_type: 0xffffffff()
raw: 05ffc00000000000 fffffc00047ce208 fffffc0004014a08 0000000000000000
raw: 0000000000000001 0000000000000003 00000000ffffff7f 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff00011fbb8280: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
 ffff00011fbb8300: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
>ffff00011fbb8380: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
                         ^
 ffff00011fbb8400: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
 ffff00011fbb8480: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
==================================================================
REISERFS warning (device loop5): jdm-13090 reiserfs_new_inode: ACLs aren't enabled in the fs, but vfs thinks they are!
REISERFS (device loop5): Created .reiserfs_priv - reserved for xattr storage.