REISERFS (device loop3): Using tea hash to sort names
REISERFS (device loop3): Created .reiserfs_priv - reserved for xattr storage.
==================================================================
BUG: KASAN: use-after-free in leaf_paste_in_buffer+0x5d0/0xa40 fs/reiserfs/lbalance.c:1043
Read of size 48 at addr ffff0000fd89aff0 by task syz.3.1069/8923

CPU: 0 PID: 8923 Comm: syz.3.1069 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/02/2026
Call trace:
 dump_backtrace+0x1c4/0x1f0 arch/arm64/kernel/stacktrace.c:158
 show_stack+0x2c/0x3c arch/arm64/kernel/stacktrace.c:165
 __dump_stack+0x30/0x40 lib/dump_stack.c:88
 dump_stack_lvl+0xf4/0x15c lib/dump_stack.c:106
 print_address_description+0x88/0x218 mm/kasan/report.c:316
 print_report+0x50/0x68 mm/kasan/report.c:420
 kasan_report+0xa8/0xfc mm/kasan/report.c:524
 check_region_inline mm/kasan/generic.c:-1 [inline]
 kasan_check_range+0x258/0x290 mm/kasan/generic.c:189
 memcpy+0x48/0x90 mm/kasan/shadow.c:65
 leaf_paste_in_buffer+0x5d0/0xa40 fs/reiserfs/lbalance.c:1043
 leaf_copy_dir_entries+0x444/0x780 fs/reiserfs/lbalance.c:108
 leaf_copy_boundary_item+0x87c/0x19f4 fs/reiserfs/lbalance.c:-1
 leaf_copy_items fs/reiserfs/lbalance.c:551 [inline]
 leaf_move_items+0x6c8/0xbd8 fs/reiserfs/lbalance.c:726
 leaf_shift_left+0xc4/0x3ac 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+0xeb4/0xdee0 fs/reiserfs/do_balan.c:1393
 do_balance+0x270/0x794 fs/reiserfs/do_balan.c:1888
 reiserfs_delete_solid_item+0x760/0xc8c fs/reiserfs/stree.c:1462
 remove_save_link+0x1e4/0x350 fs/reiserfs/super.c:540
 reiserfs_truncate_file+0x540/0xb04 fs/reiserfs/inode.c:2322
 reiserfs_setattr+0xad4/0x1014 fs/reiserfs/inode.c:3395
 reiserfs_xattr_set_handle+0x9b4/0xdbc fs/reiserfs/xattr.c:600
 reiserfs_xattr_set+0x3a8/0x4d4 fs/reiserfs/xattr.c:633
 trusted_set+0x98/0xe8 fs/reiserfs/xattr_trusted.c:31
 __vfs_setxattr+0x374/0x390 fs/xattr.c:182
 __vfs_setxattr_noperm+0x120/0x56c fs/xattr.c:216
 __vfs_setxattr_locked+0x1e8/0x214 fs/xattr.c:277
 vfs_setxattr+0x158/0x2a8 fs/xattr.c:309
 do_setxattr fs/xattr.c:594 [inline]
 setxattr+0x258/0x2d8 fs/xattr.c:617
 path_setxattr+0x130/0x260 fs/xattr.c:636
 __do_sys_setxattr fs/xattr.c:652 [inline]
 __se_sys_setxattr fs/xattr.c:648 [inline]
 __arm64_sys_setxattr+0xc4/0xe0 fs/xattr.c:648
 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline]
 invoke_syscall+0x98/0x290 arch/arm64/kernel/syscall.c:52
 el0_svc_common+0x13c/0x258 arch/arm64/kernel/syscall.c:140
 do_el0_svc+0x5c/0x134 arch/arm64/kernel/syscall.c:204
 el0_svc+0x58/0x128 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:000000001b248fa1 refcount:3 mapcount:0 mapping:00000000203432f4 index:0x237 pfn:0x13d89a
memcg:ffff0000dcc9e000
aops:def_blk_aops ino:700003
flags: 0x5ffc20000002042(referenced|workingset|private|node=0|zone=2|lastcpupid=0x7ff)
raw: 05ffc20000002042 0000000000000000 dead000000000122 ffff0000c0546018
raw: 0000000000000237 ffff00010214c1d0 00000003ffffffff ffff0000dcc9e000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff0000fd89af00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff0000fd89af80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>ffff0000fd89b000: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
                   ^
 ffff0000fd89b080: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
 ffff0000fd89b100: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
==================================================================
Unable to handle kernel write to read-only memory at virtual address ffff000101781ff0
KASAN: maybe wild-memory-access in range [0xfffc00080bc0ff80-0xfffc00080bc0ff87]
Mem abort info:
  ESR = 0x000000009600004f
  EC = 0x25: DABT (current EL), IL = 32 bits
  SET = 0, FnV = 0