void fsck_set_msg_type(struct fsck_options *options,
		const char *msg_id, const char *msg_type)
{
	int id = parse_msg_id(msg_id), type;

	if (id < 0)
		die("Unhandled message id: %s", msg_id);
	type = parse_msg_type(msg_type);

	if (type != FSCK_ERROR && msg_id_info[id].msg_type == FSCK_FATAL)
		die("Cannot demote %s to %s", msg_id, msg_type);

	if (!options->msg_type) {
		int i;
		int *msg_type;
		ALLOC_ARRAY(msg_type, FSCK_MSG_MAX);
		for (i = 0; i < FSCK_MSG_MAX; i++)
			msg_type[i] = fsck_msg_type(i, options);
		options->msg_type = msg_type;
	}

	options->msg_type[id] = type;
}

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.