CWARN.NOEFFECT.UCMP.LTIneffective comparison of unsigned value is always falseThe CWARN.NOEFFECT.UCMP.LT checker flags code outside of macros, in which there is a comparison of an unsigned value to zero that is always false. Vulnerability and riskIf 'a' is an unsigned value, the comparisons a < 0 and 0 > a are always false. These comparisons have no effect, so it's probable that design intent isn't being accomplished. Vulnerable code example
1 int foo(unsigned int a) {
2 if (a < 0)
3 return 1;
4 else
5 return 2;
6 }
Klocwork flags line 2, in which the comparison 0 < a is always false. |