REISERFS (device loop4): Created .reiserfs_priv - reserved for xattr storage.
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BUG: KASAN: use-after-free in leaf_paste_in_buffer+0x5e0/0xb08 fs/reiserfs/lbalance.c:1043
Read of size 48 at addr ffff0000f8827ff0 by task syz.4.92/4758

CPU: 0 PID: 4758 Comm: syz.4.92 Not tainted 6.1.132-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025
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
 check_region_inline mm/kasan/generic.c:-1 [inline]
 kasan_check_range+0x264/0x2a4 mm/kasan/generic.c:189
 memcpy+0x48/0x90 mm/kasan/shadow.c:65
 leaf_paste_in_buffer+0x5e0/0xb08 fs/reiserfs/lbalance.c:1043
 leaf_copy_dir_entries+0x2b0/0x9f8 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+0xa2c/0x1004 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/0x788 fs/reiserfs/do_balan.c:1888
 reiserfs_delete_solid_item+0x8fc/0xee0 fs/reiserfs/stree.c:1462
 remove_save_link+0x260/0x460 fs/reiserfs/super.c:540
 reiserfs_truncate_file+0x634/0xb1c fs/reiserfs/inode.c:2322
 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
 vfs_truncate+0x2c4/0x36c fs/open.c:111
 do_sys_truncate+0xec/0x1b4 fs/open.c:134
 __do_sys_truncate fs/open.c:146 [inline]
 __se_sys_truncate fs/open.c:144 [inline]
 __arm64_sys_truncate+0x5c/0x70 fs/open.c:144
 __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:000000009df9ae74 refcount:2 mapcount:0 mapping:0000000046e951e3 index:0x238 pfn:0x138827
memcg:ffff0000f5e1e000
aops:def_blk_aops ino:700004
flags: 0x5ffd40000002052(referenced|lru|workingset|private|node=0|zone=2|lastcpupid=0x7ff)
raw: 05ffd40000002052 fffffc0003f1a988 ffff0000f5e20208 ffff0000c049f610
raw: 0000000000000238 ffff0000dfb18e80 00000002ffffffff ffff0000f5e1e000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff0000f8827f00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff0000f8827f80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>ffff0000f8828000: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
                   ^
 ffff0000f8828080: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
 ffff0000f8828100: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
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