==================================================================
BUG: KASAN: use-after-free in leaf_paste_in_buffer+0x578/0x9f0
Read of size 48 at addr ffff000133b0dff0 by task syz-executor.0/11226

CPU: 0 PID: 11226 Comm: syz-executor.0 Not tainted 6.7.0-rc6-syzkaller-gaafe7ad77b91 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 11/10/2023
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
 kasan_check_range+0x254/0x294 mm/kasan/generic.c:187
 __asan_memcpy+0x3c/0x84 mm/kasan/shadow.c:105
 leaf_paste_in_buffer+0x578/0x9f0
 leaf_copy_dir_entries+0x2b4/0xa04 fs/reiserfs/lbalance.c:108
 leaf_copy_boundary_item+0x8c4/0x1a34 fs/reiserfs/lbalance.c:168
 leaf_copy_items fs/reiserfs/lbalance.c:551 [inline]
 leaf_move_items+0xa0c/0x1f7c fs/reiserfs/lbalance.c:726
 leaf_shift_left+0xc8/0x39c fs/reiserfs/lbalance.c:750
 balance_leaf_left fs/reiserfs/do_balan.c:616 [inline]
 balance_leaf+0x103c/0xe860 fs/reiserfs/do_balan.c:1409
 do_balance+0x27c/0x788 fs/reiserfs/do_balan.c:1888
 reiserfs_insert_item+0x940/0xa84 fs/reiserfs/stree.c:2260
 reiserfs_new_inode+0xd28/0x1698 fs/reiserfs/inode.c:2048
 reiserfs_create+0x33c/0x5a4 fs/reiserfs/namei.c:666
 lookup_open fs/namei.c:3477 [inline]
 open_last_lookups fs/namei.c:3546 [inline]
 path_openat+0xfb4/0x2888 fs/namei.c:3776
 do_filp_open+0x1bc/0x3cc fs/namei.c:3809
 do_sys_openat2+0x124/0x1b8 fs/open.c:1437
 do_sys_open fs/open.c:1452 [inline]
 __do_sys_openat fs/open.c:1468 [inline]
 __se_sys_openat fs/open.c:1463 [inline]
 __arm64_sys_openat+0x1f0/0x240 fs/open.c:1463
 __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:00000000b28ee99d refcount:2 mapcount:0 mapping:000000009fbcb7e4 index:0x214 pfn:0x173b0d
memcg:ffff0000c7d90000
aops:def_blk_aops ino:700000
flags: 0x5ffc00000008124(referenced|lru|active|private|node=0|zone=2|lastcpupid=0x7ff)
page_type: 0xffffffff()
raw: 05ffc00000008124 fffffc0004cec308 fffffc0004fbab88 ffff0000c149c210
raw: 0000000000000214 ffff0000db5faae0 00000002ffffffff ffff0000c7d90000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff000133b0df00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff000133b0df80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>ffff000133b0e000: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
                   ^
 ffff000133b0e080: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
 ffff000133b0e100: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
==================================================================
REISERFS warning: reiserfs-5093 is_leaf: item entry count seems wrong *3.5*[2 1 0(1) DIR], item_len 35, item_location 3937, free_space(entry_count) 2
REISERFS error (device loop0): vs-5150 search_by_key: invalid format found in block 531. Fsck?
REISERFS (device loop0): Remounting filesystem read-only
REISERFS error (device loop0): zam-7001 reiserfs_find_entry: io error