static bool rootdir_empty(struct super_block *sb, unsigned long block)
{
	int offset = 0, files = 0, de_len;
	struct iso_directory_record *de;
	struct buffer_head *bh;

	bh = sb_bread(sb, block);
	if (!bh)
		return true;
	while (files < 3) {
		de = (struct iso_directory_record *) (bh->b_data + offset);
		de_len = *(unsigned char *) de;
		if (de_len == 0)
			break;
		files++;
		offset += de_len;
	}
	brelse(bh);
	return files < 3;
}

The product receives input or data, but it does not validate or incorrectly validates that the input has the properties that are required to process the data safely and correctly.