static int parse_msg_type(const char *str)
{
	if (!strcmp(str, "error"))
		return FSCK_ERROR;
	else if (!strcmp(str, "warn"))
		return FSCK_WARN;
	else if (!strcmp(str, "ignore"))
		return FSCK_IGNORE;
	else
		die("Unknown fsck message type: '%s'", str);
}

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.