commit 281fda27 upstream.

Make sure that data_size is less than LEB size.
Otherwise a handcrafted UBI image is able to trigger
an out of bounds memory access in ubi_compare_lebs().
Signed-off-by: Richard Weinberger <richard@nod.at>
Reviewed-by: David Gstir <david@sigma-star.at>
[lizf: Backported to 3.4: use dbg_err() instead of ubi_err()];
Signed-off-by: Zefan Li <lizefan@huawei.com>