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_entries+0x990/0xae0 fs/reiserfs/lbalance.c:1351
Read of size 2 at addr ffff0000f7ee3088 by task syz.3.842/7911

CPU: 1 PID: 7911 Comm: syz.3.842 Not tainted 6.1.137-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+0x30/0x40 lib/dump_stack.c:88
 dump_stack_lvl+0xf8/0x160 lib/dump_stack.c:106
 print_address_description+0x88/0x220 mm/kasan/report.c:316
 print_report+0x50/0x68 mm/kasan/report.c:427
 kasan_report+0xa8/0x100 mm/kasan/report.c:531
 __asan_report_load_n_noabort+0x28/0x34 mm/kasan/report_generic.c:361
 leaf_paste_entries+0x990/0xae0 fs/reiserfs/lbalance.c:1351
 leaf_copy_dir_entries+0x4dc/0x788 fs/reiserfs/lbalance.c:119
 leaf_copy_boundary_item+0x888/0x19dc fs/reiserfs/lbalance.c:-1
 leaf_copy_items fs/reiserfs/lbalance.c:551 [inline]
 leaf_move_items+0x694/0xb9c fs/reiserfs/lbalance.c:726
 leaf_shift_left+0xc8/0x3ac 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+0x182c/0xd2f4 fs/reiserfs/do_balan.c:1393
 do_balance+0x260/0x774 fs/reiserfs/do_balan.c:1888
 reiserfs_delete_solid_item+0x710/0xc34 fs/reiserfs/stree.c:1462
 remove_save_link+0x1cc/0x320 fs/reiserfs/super.c:540
 reiserfs_truncate_file+0x69c/0xaf4 fs/reiserfs/inode.c:2322
 reiserfs_vfs_truncate_file+0x34/0x4c fs/reiserfs/file.c:133
 reiserfs_direct_IO+0x1e8/0x20c fs/reiserfs/inode.c:3258
 generic_file_direct_write+0x31c/0x620 mm/filemap.c:3770
 __generic_file_write_iter+0x1bc/0x37c mm/filemap.c:3930
 generic_file_write_iter+0xb4/0x2b0 mm/filemap.c:4006
 do_iter_readv_writev fs/read_write.c:-1 [inline]
 do_iter_write+0x530/0x91c fs/read_write.c:861
 vfs_writev fs/read_write.c:934 [inline]
 do_pwritev+0x1c8/0x2fc fs/read_write.c:1031
 __do_sys_pwritev2 fs/read_write.c:1090 [inline]
 __se_sys_pwritev2 fs/read_write.c:1081 [inline]
 __arm64_sys_pwritev2+0xd4/0x108 fs/read_write.c:1081
 __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+0x58/0x138 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:00000000a3262457 refcount:0 mapcount:0 mapping:0000000000000000 index:0x1 pfn:0x137ee3
flags: 0x5ffc00000000000(node=0|zone=2|lastcpupid=0x7ff)
raw: 05ffc00000000000 dead000000000100 dead000000000122 0000000000000000
raw: 0000000000000001 0000000000000000 00000000ffffffff 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff0000f7ee2f80: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
 ffff0000f7ee3000: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
>ffff0000f7ee3080: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
                      ^
 ffff0000f7ee3100: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
 ffff0000f7ee3180: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
==================================================================
Unable to handle kernel paging request at virtual address dfff800000000000