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+0x5c/0x84 lib/string.c:566
Read of size 1 at addr ffff0000e128a7a3 by task syz-executor.0/4390

CPU: 0 PID: 4390 Comm: syz-executor.0 Not tainted 5.15.180-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/19/2025
Call trace:
 dump_backtrace+0x0/0x43c arch/arm64/kernel/stacktrace.c:152
 show_stack+0x2c/0x3c arch/arm64/kernel/stacktrace.c:216
 __dump_stack+0x30/0x40 lib/dump_stack.c:88
 dump_stack_lvl+0xf8/0x160 lib/dump_stack.c:106
 print_address_description+0x78/0x30c mm/kasan/report.c:248
 __kasan_report mm/kasan/report.c:434 [inline]
 kasan_report+0xec/0x15c mm/kasan/report.c:451
 __asan_report_load1_noabort+0x44/0x50 mm/kasan/report_generic.c:306
 strlen+0x5c/0x84 lib/string.c:566
 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+0x79c/0x1390 fs/reiserfs/namei.c:331
 reiserfs_lookup+0x15c/0x378 fs/reiserfs/namei.c:368
 __lookup_slow+0x24c/0x380 fs/namei.c:1663
 lookup_one_len+0x178/0x28c fs/namei.c:2718
 reiserfs_lookup_privroot+0x8c/0x204 fs/reiserfs/xattr.c:980
 reiserfs_fill_super+0x1214/0x1bb4 fs/reiserfs/super.c:2196
 mount_bdev+0x264/0x358 fs/super.c:1400
 get_super_block+0x44/0x58 fs/reiserfs/super.c:2608
 legacy_get_tree+0xd4/0x16c fs/fs_context.c:611
 vfs_get_tree+0x90/0x274 fs/super.c:1530
 do_new_mount+0x228/0x810 fs/namespace.c:3012
 path_mount+0x5b4/0x1000 fs/namespace.c:3342
 do_mount fs/namespace.c:3355 [inline]
 __do_sys_mount fs/namespace.c:3563 [inline]
 __se_sys_mount fs/namespace.c:3540 [inline]
 __arm64_sys_mount+0x514/0x5e4 fs/namespace.c:3540
 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline]
 invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:52
 el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:142
 do_el0_svc+0x58/0x14c arch/arm64/kernel/syscall.c:181
 el0_svc+0x78/0x1e0 arch/arm64/kernel/entry-common.c:608
 el0t_64_sync_handler+0xcc/0xe4 arch/arm64/kernel/entry-common.c:626
 el0t_64_sync+0x1a0/0x1a4 arch/arm64/kernel/entry.S:584

The buggy address belongs to the page:
page:00000000e1d9d8f7 refcount:0 mapcount:0 mapping:0000000000000000 index:0x1 pfn:0x12128a
flags: 0x5ffc00000000000(node=0|zone=2|lastcpupid=0x7ff)
raw: 05ffc00000000000 fffffc000384a2c8 ffff0001b42d2520 0000000000000000
raw: 0000000000000001 0000000000000000 00000000ffffffff 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff0000e128a680: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
 ffff0000e128a700: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
>ffff0000e128a780: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
                               ^
 ffff0000e128a800: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
 ffff0000e128a880: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
==================================================================