CWE-190 integer overflow in btConvexHullComputer

[issakomi]

Fixed integer overflow in btConvexHullComputer.cpp

Example to reproduce similar issue

#include <iostream>
#include <limits.h>

int main(int, char **)
{
	int x = INT_MAX;
	long long y0 = x * 5;
	long long y1 = (long long)x * 5;
	std::cout << "y0=" << y0 << " y1=" << y1 << std::endl;
	return 0;
}

Output: y0=2147483643 y1=10737418235

Coverity report:

[issakomi]

BTW, if in the above example code set const int x = INT_MAX instead of int x = INT_MAX , compiler (gcc 8.3) will detect the overflow and warn.

[erwincoumans]

Thanks for the contribution, looks good to me.