REISERFS (device loop5): Using tea hash to sort names
REISERFS (device loop5): Created .reiserfs_priv - reserved for xattr storage.
==================================================================
BUG: KASAN: use-after-free in leaf_paste_in_buffer+0x578/0x9f0
Read of size 48 at addr ffff0000f7a21ff0 by task syz.5.240/5382

CPU: 1 PID: 5382 Comm: syz.5.240 Not tainted 6.1.124-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024
Call trace:
 dump_backtrace+0x1c8/0x1f4 arch/arm64/kernel/stacktrace.c:158
 show_stack+0x2c/0x3c arch/arm64/kernel/stacktrace.c:165
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0x108/0x170 lib/dump_stack.c:106
 print_address_description mm/kasan/report.c:316 [inline]
 print_report+0x174/0x4c0 mm/kasan/report.c:427
 kasan_report+0xd4/0x130 mm/kasan/report.c:531
 kasan_check_range+0x264/0x2a4 mm/kasan/generic.c:189
 memcpy+0x48/0x90 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
 balance_leaf_when_delete_left fs/reiserfs/do_balan.c:167 [inline]
 balance_leaf_when_delete fs/reiserfs/do_balan.c:272 [inline]
 balance_leaf+0xa2a4/0xe860 fs/reiserfs/do_balan.c:1393
 do_balance+0x27c/0x788 fs/reiserfs/do_balan.c:1888
 reiserfs_cut_from_item+0x12b8/0x1c98 fs/reiserfs/stree.c:1838
 reiserfs_do_truncate+0x89c/0x11c8 fs/reiserfs/stree.c:1973
 reiserfs_truncate_file+0x510/0xb1c fs/reiserfs/inode.c:2310
 reiserfs_setattr+0xb58/0x101c fs/reiserfs/inode.c:3395
 notify_change+0xb58/0xe1c fs/attr.c:499
 do_truncate+0x1c0/0x28c fs/open.c:65
 handle_truncate fs/namei.c:3285 [inline]
 do_open fs/namei.c:3630 [inline]
 path_openat+0x1fa0/0x2548 fs/namei.c:3783
 do_filp_open+0x1bc/0x3cc fs/namei.c:3810
 do_sys_openat2+0x128/0x3e0 fs/open.c:1318
 do_sys_open fs/open.c:1334 [inline]
 __do_sys_openat fs/open.c:1350 [inline]
 __se_sys_openat fs/open.c:1345 [inline]
 __arm64_sys_openat+0x1f0/0x240 fs/open.c:1345
 __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+0x58/0x168 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:00000000f4fe6990 refcount:2 mapcount:0 mapping:000000002385afe4 index:0x219 pfn:0x137a21
memcg:ffff0000d47f4000
aops:def_blk_aops ino:700005
flags: 0x5ffd40000002052(referenced|lru|workingset|private|node=0|zone=2|lastcpupid=0x7ff)
raw: 05ffd40000002052 fffffc000388ea48 fffffc0003f0bd88 ffff0000c0498810
raw: 0000000000000219 ffff0000f45909f8 00000002ffffffff ffff0000d47f4000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff0000f7a21f00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff0000f7a21f80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>ffff0000f7a22000: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
                   ^
 ffff0000f7a22080: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
 ffff0000f7a22100: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
==================================================================
REISERFS error (device loop5): vs-4010 is_reusable: block number is out of range 11822 (1024)
REISERFS (device loop5): Remounting filesystem read-only
REISERFS error (device loop5): vs-4010 is_reusable: block number is out of range 265880 (1024)
REISERFS error (device loop5): vs-4010 is_reusable: block number is out of range 593568 (1024)
REISERFS error (device loop5): vs-4080 _reiserfs_free_block: block 1: bit already cleared
REISERFS error (device loop5): vs-4080 _reiserfs_free_block: block 1: bit already cleared
REISERFS warning (device loop5): clm-6006 reiserfs_dirty_inode: writing inode 5 on readonly FS