REISERFS (device loop0): journal params: device loop0, size 512, journal first block 18, max trans len 256, max batch 225, max commit age 30, max trans age 30
REISERFS (device loop0): checking transaction log (loop0)
REISERFS (device loop0): Using r5 hash to sort names
==================================================================
BUG: KASAN: use-after-free in strlen+0x54/0x70 lib/string.c:495
Read of size 1 at addr ffff0000e57a2304 by task syz-executor323/4291

CPU: 1 PID: 4291 Comm: syz-executor323 Not tainted 6.1.126-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024
Call trace:
 dump_backtrace+0x1c8/0x1f4 arch/arm64/kernel/stacktrace.c:158
 show_stack+0x2c/0x3c arch/arm64/kernel/stacktrace.c:165
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0x108/0x170 lib/dump_stack.c:106
 print_address_description mm/kasan/report.c:316 [inline]
 print_report+0x174/0x4c0 mm/kasan/report.c:427
 kasan_report+0xd4/0x130 mm/kasan/report.c:531
 __asan_report_load1_noabort+0x2c/0x38 mm/kasan/report_generic.c:348
 strlen+0x54/0x70 lib/string.c:495
 set_de_name_and_namelen fs/reiserfs/namei.c:82 [inline]
 linear_search_in_dir_item fs/reiserfs/namei.c:262 [inline]
 reiserfs_find_entry+0x898/0x149c fs/reiserfs/namei.c:331
 reiserfs_lookup+0x184/0x3c4 fs/reiserfs/namei.c:368
 __lookup_slow+0x250/0x374 fs/namei.c:1690
 lookup_one_len+0x178/0x28c fs/namei.c:2740
 reiserfs_lookup_privroot+0x8c/0x204 fs/reiserfs/xattr.c:973
 reiserfs_fill_super+0x15b4/0x2028 fs/reiserfs/super.c:2192
 mount_bdev+0x274/0x370 fs/super.c:1443
 get_super_block+0x44/0x58 fs/reiserfs/super.c:2601
 legacy_get_tree+0xd4/0x16c fs/fs_context.c:632
 vfs_get_tree+0x90/0x274 fs/super.c:1573
 do_new_mount+0x278/0x8fc fs/namespace.c:3056
 path_mount+0x590/0xe5c fs/namespace.c:3386
 do_mount fs/namespace.c:3399 [inline]
 __do_sys_mount fs/namespace.c:3607 [inline]
 __se_sys_mount fs/namespace.c:3584 [inline]
 __arm64_sys_mount+0x45c/0x594 fs/namespace.c:3584
 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline]
 invoke_syscall+0x98/0x2bc arch/arm64/kernel/syscall.c:52
 el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:140
 do_el0_svc+0x58/0x13c arch/arm64/kernel/syscall.c:204
 el0_svc+0x58/0x168 arch/arm64/kernel/entry-common.c:637
 el0t_64_sync_handler+0x84/0xf0 arch/arm64/kernel/entry-common.c:655
 el0t_64_sync+0x18c/0x190 arch/arm64/kernel/entry.S:585

The buggy address belongs to the physical page:
page:0000000066827fbc refcount:0 mapcount:-128 mapping:0000000000000000 index:0x0 pfn:0x1257a2
flags: 0x5ffc00000000000(node=0|zone=2|lastcpupid=0x7ff)
raw: 05ffc00000000000 ffff0001fea73578 ffff0001fea73578 0000000000000000
raw: 0000000000000000 0000000000000001 00000000ffffff7f 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff0000e57a2200: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
 ffff0000e57a2280: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
>ffff0000e57a2300: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
                   ^
 ffff0000e57a2380: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
 ffff0000e57a2400: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
==================================================================