1.1.8.25. osx.coreFoundation.CFRetainRelease (C)
Check for null arguments to CFRetain/CFRelease/CFMakeCollectable.

Examples:

void test(CFTypeRef p) {
  if (!p)
    CFRetain(p); // warn
}

void test(int x, CFTypeRef p) {
  if (p)
    return;

  CFRelease(p); // warn
}