CWARN.NOEFFECT.UCMP.GE.MACRO
Ineffective comparison of unsigned value in a macro is always true
The CWARN.NOEFFECT.UCMP.GE.MACRO checker flags code in macros, in which there is a comparison of an unsigned value to zero that is always true.
Vulnerability and risk
If 'a' is an unsigned value, the comparisons a >= 0 and 0 <= a are always true. These comparisons have no effect, so it's probable that design intent isn't being accomplished.
Vulnerable code example
Copy
#define POSITIVE_LOOP(x) while (x >= 0) x--;
int foo(unsigned int a) {
POSITIVE_LOOP(a);
return 0;
}Klocwork flags line 4, in which the macro POSITIVE_LOOP contains a condition that is always true.