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 tea hash to sort names
==================================================================
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+0x458/0xe34 fs/reiserfs/namei.c:165
Read of size 4 at addr ffff0001742c2024 by task syz-executor585/4294

CPU: 0 PID: 4294 Comm: syz-executor585 Not tainted 6.1.135-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025
Call trace:
 dump_backtrace+0x1c8/0x1f4 arch/arm64/kernel/stacktrace.c:158
 show_stack+0x2c/0x3c arch/arm64/kernel/stacktrace.c:165
 __dump_stack+0x30/0x40 lib/dump_stack.c:88
 dump_stack_lvl+0xf8/0x160 lib/dump_stack.c:106
 print_address_description+0x88/0x220 mm/kasan/report.c:316
 print_report+0x50/0x68 mm/kasan/report.c:427
 kasan_report+0xa8/0x100 mm/kasan/report.c:531
 __asan_report_load_n_noabort+0x28/0x34 mm/kasan/report_generic.c:361
 bin_search_in_dir_item fs/reiserfs/namei.c:40 [inline]
 search_by_entry_key+0x458/0xe34 fs/reiserfs/namei.c:165
 reiserfs_find_entry+0x260/0x13b8 fs/reiserfs/namei.c:322
 reiserfs_lookup+0x15c/0x378 fs/reiserfs/namei.c:368
 __lookup_slow+0x24c/0x370 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+0x18ec/0x1d40 fs/reiserfs/super.c:2174
 mount_bdev+0x264/0x358 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+0x228/0x810 fs/namespace.c:3057
 path_mount+0x5b4/0xe78 fs/namespace.c:3387
 do_mount fs/namespace.c:3400 [inline]
 __do_sys_mount fs/namespace.c:3608 [inline]
 __se_sys_mount fs/namespace.c:3585 [inline]
 __arm64_sys_mount+0x49c/0x584 fs/namespace.c:3585
 __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+0x58/0x138 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:000000003de3eee6 refcount:0 mapcount:0 mapping:0000000000000000 index:0x1 pfn:0x1b42c2
flags: 0x5ffc00000000000(node=0|zone=2|lastcpupid=0x7ff)
raw: 05ffc00000000000 fffffc0005d0b0c8 ffff0001b3e30e20 0000000000000000
raw: 0000000000000001 0000000000000000 00000000ffffffff 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff0001742c1f00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff0001742c1f80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>ffff0001742c2000: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
                               ^
 ffff0001742c2080: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
 ffff0001742c2100: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
==================================================================
REISERFS (device loop0): Created .reiserfs_priv - reserved for xattr storage.