==================================================================
BUG: KASAN: out-of-bounds in leaf_paste_in_buffer+0x578/0x9f0
Read of size 48 at addr ffff0000debf0ff0 by task syz.0.56/4339

CPU: 1 PID: 4339 Comm: syz.0.56 Not tainted 5.15.167-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/06/2024
Call trace:
 dump_backtrace+0x0/0x530 arch/arm64/kernel/stacktrace.c:152
 show_stack+0x2c/0x3c arch/arm64/kernel/stacktrace.c:216
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0x108/0x170 lib/dump_stack.c:106
 print_address_description+0x7c/0x3f0 mm/kasan/report.c:248
 __kasan_report mm/kasan/report.c:434 [inline]
 kasan_report+0x174/0x1e4 mm/kasan/report.c:451
 kasan_check_range+0x274/0x2b4 mm/kasan/generic.c:189
 memcpy+0x90/0xe8 mm/kasan/shadow.c:65
 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_when_delete_left fs/reiserfs/do_balan.c:194 [inline]
 balance_leaf_when_delete fs/reiserfs/do_balan.c:272 [inline]
 balance_leaf+0x2a70/0xe860 fs/reiserfs/do_balan.c:1393
 do_balance+0x27c/0x790 fs/reiserfs/do_balan.c:1888
 reiserfs_delete_item+0x994/0xde8 fs/reiserfs/stree.c:1371
 direct2indirect+0x884/0x10c0 fs/reiserfs/tail_conversion.c:139
 reiserfs_get_block+0x3a8c/0x3fd0 fs/reiserfs/inode.c:957
 __block_write_begin_int+0x3ec/0x1608 fs/buffer.c:2012
 __block_write_begin+0x40/0x54 fs/buffer.c:2062
 __reiserfs_write_begin+0x334/0x558 fs/reiserfs/inode.c:2850
 convert_tail_for_hole fs/reiserfs/inode.c:620 [inline]
 reiserfs_get_block+0x2c80/0x3fd0 fs/reiserfs/inode.c:929
 __block_write_begin_int+0x3ec/0x1608 fs/buffer.c:2012
 __block_write_begin+0x40/0x54 fs/buffer.c:2062
 reiserfs_write_begin+0x3c8/0x654 fs/reiserfs/inode.c:2790
 generic_perform_write+0x24c/0x520 mm/filemap.c:3785
 __generic_file_write_iter+0x230/0x454 mm/filemap.c:3912
 generic_file_write_iter+0xb4/0x1b8 mm/filemap.c:3944
 call_write_iter include/linux/fs.h:2172 [inline]
 new_sync_write fs/read_write.c:507 [inline]
 vfs_write+0x884/0xb44 fs/read_write.c:594
 ksys_write+0x15c/0x26c fs/read_write.c:647
 __do_sys_write fs/read_write.c:659 [inline]
 __se_sys_write fs/read_write.c:656 [inline]
 __arm64_sys_write+0x7c/0x90 fs/read_write.c:656
 __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+0x7c/0x1f0 arch/arm64/kernel/entry-common.c:608
 el0t_64_sync_handler+0x84/0xe4 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:0000000080a5eb04 refcount:3 mapcount:0 mapping:0000000059aa6270 index:0x215 pfn:0x11ebf0
memcg:ffff0000d5ffc000
aops:def_blk_aops ino:700000
flags: 0x5ffc00000002022(referenced|active|private|node=0|zone=2|lastcpupid=0x7ff)
raw: 05ffc00000002022 0000000000000000 dead000000000122 ffff0000c51b4f48
raw: 0000000000000215 ffff0000dd84f740 00000003ffffffff ffff0000d5ffc000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff0000debf0f00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff0000debf0f80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>ffff0000debf1000: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
                   ^
 ffff0000debf1080: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff0000debf1100: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
==================================================================