ntfs: volume version 3.1.
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BUG: KASAN: use-after-free in ntfs_ucsncmp fs/ntfs/unistr.c:142 [inline]
BUG: KASAN: use-after-free in ntfs_are_names_equal+0x2f8/0x340 fs/ntfs/unistr.c:61
Read of size 2 at addr ffff88803880dee8 by task syz-executor.4/8464

CPU: 0 PID: 8464 Comm: syz-executor.4 Not tainted 5.10.0-rc1-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 __dump_stack lib/dump_stack.c:77 [inline]
 dump_stack+0x1d6/0x29e lib/dump_stack.c:118
 print_address_description+0x6c/0x640 mm/kasan/report.c:385
 __kasan_report mm/kasan/report.c:545 [inline]
 kasan_report+0x136/0x1e0 mm/kasan/report.c:562
 ntfs_ucsncmp fs/ntfs/unistr.c:142 [inline]
 ntfs_are_names_equal+0x2f8/0x340 fs/ntfs/unistr.c:61
 ntfs_attr_find+0x36d/0xac0 fs/ntfs/attrib.c:614
 ntfs_attr_lookup+0x1ec/0x23f0 fs/ntfs/attrib.c:1189
 ntfs_read_locked_attr_inode fs/ntfs/inode.c:1233 [inline]
 ntfs_attr_iget+0x48c/0x2190 fs/ntfs/inode.c:238
 ntfs_read_locked_inode+0x36d0/0x4e00 fs/ntfs/inode.c:954
 ntfs_iget+0xc2/0x130 fs/ntfs/inode.c:177
 load_system_files fs/ntfs/super.c:1974 [inline]
 ntfs_fill_super+0x5e1c/0x8df0 fs/ntfs/super.c:2893
 mount_bdev+0x24f/0x360 fs/super.c:1419
 legacy_get_tree+0xea/0x180 fs/fs_context.c:592
 vfs_get_tree+0x88/0x270 fs/super.c:1549
 do_new_mount fs/namespace.c:2875 [inline]
 path_mount+0x17b4/0x2a20 fs/namespace.c:3205
 do_mount fs/namespace.c:3218 [inline]
 __do_sys_mount fs/namespace.c:3426 [inline]
 __se_sys_mount+0x28c/0x320 fs/namespace.c:3403
 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x44/0xa9
RIP: 0033:0x4608aa
Code: b8 a6 00 00 00 0f 05 48 3d 01 f0 ff ff 0f 83 ad 89 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 49 89 ca b8 a5 00 00 00 0f 05 <48> 3d 01 f0 ff ff 0f 83 8a 89 fb ff c3 66 0f 1f 84 00 00 00 00 00
RSP: 002b:00007fc65432ba88 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 00007fc65432bb20 RCX: 00000000004608aa
RDX: 0000000020000000 RSI: 0000000020000100 RDI: 00007fc65432bae0
RBP: 00007fc65432bae0 R08: 00007fc65432bb20 R09: 0000000020000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000020000000
R13: 0000000020000100 R14: 0000000020000200 R15: 000000002007dc00

The buggy address belongs to the page:
page:00000000fbe9846c refcount:0 mapcount:0 mapping:0000000000000000 index:0x1 pfn:0x3880d
flags: 0xfffe0000000000()
raw: 00fffe0000000000 ffff8880ba039488 ffff8880ba039488 0000000000000000
raw: 0000000000000001 0000000000000000 00000000ffffffff 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff88803880dd80: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
 ffff88803880de00: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
>ffff88803880de80: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
                                                          ^
 ffff88803880df00: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
 ffff88803880df80: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
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