static double filter_bell(const double x1)
{
	const double x = x1 < 0.0 ? -x1 : x1;

	if (x < 0.5) return (0.75 - x*x);
	if (x < 1.5) return (0.5 * pow(x - 1.5, 2.0));
	return 0.0;
}

This vulnerability category highlights issues in resource management where failures to properly release memory, file handles, or other resources can degrade system performance or enable denial-of-service conditions.