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
REISERFS (device loop0): Created .reiserfs_priv - reserved for xattr storage.
==================================================================
BUG: KASAN: out-of-bounds in memcpy include/linux/string.h:377 [inline]
BUG: KASAN: out-of-bounds in leaf_paste_in_buffer+0xa27/0xc20 fs/reiserfs/lbalance.c:1043
Read of size 80 at addr ffff88808af42fe0 by task syz-executor400/8105

CPU: 1 PID: 8105 Comm: syz-executor400 Not tainted 4.19.211-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/26/2022
Call Trace:
 __dump_stack lib/dump_stack.c:77 [inline]
 dump_stack+0x1fc/0x2ef lib/dump_stack.c:118
 print_address_description.cold+0x54/0x219 mm/kasan/report.c:256
 kasan_report_error.cold+0x8a/0x1b9 mm/kasan/report.c:354
 kasan_report+0x8f/0xa0 mm/kasan/report.c:412
 memcpy+0x20/0x50 mm/kasan/kasan.c:302
 memcpy include/linux/string.h:377 [inline]
 leaf_paste_in_buffer+0xa27/0xc20 fs/reiserfs/lbalance.c:1043
 leaf_copy_dir_entries.isra.0+0x7f3/0x980 fs/reiserfs/lbalance.c:108
 leaf_copy_boundary_item fs/reiserfs/lbalance.c:168 [inline]
 leaf_copy_items fs/reiserfs/lbalance.c:551 [inline]
 leaf_move_items+0x17f6/0x3b60 fs/reiserfs/lbalance.c:726
 leaf_shift_left+0xa0/0x380 fs/reiserfs/lbalance.c:750
 balance_leaf_left fs/reiserfs/do_balan.c:622 [inline]
 balance_leaf+0x2fb8/0xca70 fs/reiserfs/do_balan.c:1420
 do_balance+0x30a/0x760 fs/reiserfs/do_balan.c:1899
 reiserfs_insert_item+0xbf3/0x1010 fs/reiserfs/stree.c:2271
 reiserfs_get_block+0x122b/0x3e40 fs/reiserfs/inode.c:876
 __block_write_begin_int+0x46c/0x17b0 fs/buffer.c:1978
 reiserfs_write_begin+0x39f/0xa10 fs/reiserfs/inode.c:2794
 generic_perform_write+0x1f8/0x4d0 mm/filemap.c:3170
 __generic_file_write_iter+0x24b/0x610 mm/filemap.c:3295
 generic_file_write_iter+0x3f8/0x730 mm/filemap.c:3323
 call_write_iter include/linux/fs.h:1821 [inline]
 new_sync_write fs/read_write.c:474 [inline]
 __vfs_write+0x51b/0x770 fs/read_write.c:487
 __kernel_write+0x109/0x370 fs/read_write.c:506
 dump_emit+0x183/0x300 fs/coredump.c:801
 elf_core_dump+0x2914/0x4c10 fs/binfmt_elf.c:2335
 do_coredump+0x1d4e/0x2d60 fs/coredump.c:765
 get_signal+0xed9/0x1f70 kernel/signal.c:2583
 do_signal+0x8f/0x1670 arch/x86/kernel/signal.c:799
 exit_to_usermode_loop+0x204/0x2a0 arch/x86/entry/common.c:163
 prepare_exit_to_usermode arch/x86/entry/common.c:198 [inline]
 syscall_return_slowpath arch/x86/entry/common.c:271 [inline]
 do_syscall_64+0x538/0x620 arch/x86/entry/common.c:296
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x7fa5c6cf8819
Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 01 18 00 00 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 c0 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fffe032b488 EFLAGS: 00000246 ORIG_RAX: 000000000000004d
RAX: ffffffffffffffe5 RBX: 0000000000000003 RCX: 00007fa5c6cf8819
RDX: 00007fa5c6cf8819 RSI: 000001fffffff000 RDI: 0000000000000006
RBP: 00007fffe032b4f0 R08: 00000000000f4240 R09: 00000000000f4240
R10: 00000000000f4240 R11: 0000000000000246 R12: 0000000000000000
R13: 00000000000f4240 R14: 00007fffe032b4b4 R15: 00007fffe032b4c0

The buggy address belongs to the page:
page:ffffea00022bd080 count:2 mapcount:0 mapping:ffff8880b1adeae0 index:0x213
flags: 0xfff00000001064(referenced|lru|active|private)
raw: 00fff00000001064 ffffea00022bd048 ffffea00022baa88 ffff8880b1adeae0
raw: 0000000000000213 ffff88808db6d7e0 00000002ffffffff ffff8880b59f68c0
page dumped because: kasan: bad access detected
page->mem_cgroup:ffff8880b59f68c0

Memory state around the buggy address:
 ffff88808af42f00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff88808af42f80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>ffff88808af43000: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
                                     ^
 ffff88808af43080: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff88808af43100: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
==================================================================