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+0x54/0x60 lib/string.c:566
Read of size 1 at addr ffff88806d9687a3 by task syz-executor.0/3905

CPU: 1 PID: 3905 Comm: syz-executor.0 Not tainted 5.15.174-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 11/25/2024
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0x1e3/0x2d0 lib/dump_stack.c:106
 print_address_description+0x63/0x3b0 mm/kasan/report.c:248
 __kasan_report mm/kasan/report.c:434 [inline]
 kasan_report+0x16b/0x1c0 mm/kasan/report.c:451
 strlen+0x54/0x60 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+0x97e/0x19b0 fs/reiserfs/namei.c:331
 reiserfs_lookup+0x1e6/0x4b0 fs/reiserfs/namei.c:368
 __lookup_slow+0x275/0x3d0 fs/namei.c:1663
 lookup_one_len+0x187/0x2d0 fs/namei.c:2718
 reiserfs_lookup_privroot+0x85/0x1e0 fs/reiserfs/xattr.c:980
 reiserfs_fill_super+0x191e/0x2690 fs/reiserfs/super.c:2196
 mount_bdev+0x2c9/0x3f0 fs/super.c:1400
 legacy_get_tree+0xeb/0x180 fs/fs_context.c:611
 vfs_get_tree+0x88/0x270 fs/super.c:1530
 do_new_mount+0x2ba/0xb40 fs/namespace.c:3012
 do_mount fs/namespace.c:3355 [inline]
 __do_sys_mount fs/namespace.c:3563 [inline]
 __se_sys_mount+0x2d5/0x3c0 fs/namespace.c:3540
 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: 0033:0x7fdb38e8122a
Code: d8 64 89 02 48 c7 c0 ff ff ff ff eb a6 e8 de 09 00 00 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 49 89 ca b8 a5 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 b0 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fdb38200ee8 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 00007fdb38200f80 RCX: 00007fdb38e8122a
RDX: 00000000200000c0 RSI: 0000000020000040 RDI: 00007fdb38200f40
RBP: 00000000200000c0 R08: 00007fdb38200f80 R09: 0000000000008001
R10: 0000000000008001 R11: 0000000000000246 R12: 0000000020000040
R13: 00007fdb38200f40 R14: 0000000000001122 R15: 0000000020000080
 </TASK>

The buggy address belongs to the page:
page:ffffea0001b65a00 refcount:0 mapcount:0 mapping:0000000000000000 index:0x1 pfn:0x6d968
flags: 0xfff00000000000(node=0|zone=1|lastcpupid=0x7ff)
raw: 00fff00000000000 ffffea0001b65a48 ffff8880b9b40960 0000000000000000
raw: 0000000000000001 0000000000000000 00000000ffffffff 0000000000000000
page dumped because: kasan: bad access detected
page_owner tracks the page as freed
page last allocated via order 0, migratetype Movable, gfp_mask 0x1112c4a(GFP_NOFS|__GFP_HIGHMEM|__GFP_NOWARN|__GFP_NORETRY|__GFP_HARDWALL|__GFP_MOVABLE|__GFP_SKIP_KASAN_POISON), pid 3509, ts 50683356856, free_ts 73190172932
 prep_new_page mm/page_alloc.c:2426 [inline]
 get_page_from_freelist+0x3b78/0x3d40 mm/page_alloc.c:4192
 __alloc_pages+0x272/0x700 mm/page_alloc.c:5465
 __page_cache_alloc+0xd4/0x4a0 mm/filemap.c:1022
 page_cache_ra_unbounded+0x2b1/0x930 mm/readahead.c:216
 page_cache_async_readahead include/linux/pagemap.h:856 [inline]
 filemap_readahead mm/filemap.c:2525 [inline]
 filemap_get_pages mm/filemap.c:2567 [inline]
 filemap_read+0x980/0x2980 mm/filemap.c:2634
 __kernel_read+0x5ac/0xa60 fs/read_write.c:443
 integrity_kernel_read+0xac/0xf0 security/integrity/iint.c:228
 ima_calc_file_hash_tfm security/integrity/ima/ima_crypto.c:485 [inline]
 ima_calc_file_shash security/integrity/ima/ima_crypto.c:516 [inline]
 ima_calc_file_hash+0xa5d/0x1c00 security/integrity/ima/ima_crypto.c:573
 ima_collect_measurement+0x323/0x820 security/integrity/ima/ima_api.c:255
 process_measurement+0x1363/0x21c0 security/integrity/ima/ima_main.c:351
 ima_file_check+0xf3/0x180 security/integrity/ima/ima_main.c:533
 do_open fs/namei.c:3610 [inline]
 path_openat+0x2748/0x2f20 fs/namei.c:3742
 do_filp_open+0x21c/0x460 fs/namei.c:3769
 file_open_name+0x242/0x2a0 fs/open.c:1198
 __do_sys_swapon mm/swapfile.c:3187 [inline]
 __se_sys_swapon+0x8fc/0x5690 mm/swapfile.c:3146
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x3b/0xb0 arch/x86/entry/common.c:80
page last free stack trace:
 reset_page_owner include/linux/page_owner.h:24 [inline]
 free_pages_prepare mm/page_alloc.c:1340 [inline]
 free_pcp_prepare mm/page_alloc.c:1391 [inline]
 free_unref_page_prepare+0xc34/0xcf0 mm/page_alloc.c:3317
 free_unref_page_list+0x1f7/0x8e0 mm/page_alloc.c:3433
 release_pages+0x1bb9/0x1f40 mm/swap.c:963
 __pagevec_release+0x80/0xf0 mm/swap.c:983
 pagevec_release include/linux/pagevec.h:81 [inline]
 truncate_inode_pages_range+0x48b/0x1290 mm/truncate.c:329
 ext4_evict_inode+0x2ae/0x1100 fs/ext4/inode.c:224
 evict+0x529/0x930 fs/inode.c:622
 do_unlinkat+0x508/0x950 fs/namei.c:4355
 __do_sys_unlink fs/namei.c:4396 [inline]
 __se_sys_unlink fs/namei.c:4394 [inline]
 __x64_sys_unlink+0x45/0x50 fs/namei.c:4394
 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

Memory state around the buggy address:
 ffff88806d968680: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
 ffff88806d968700: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
>ffff88806d968780: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
                               ^
 ffff88806d968800: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
 ffff88806d968880: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
==================================================================