check for overflow

Thanks to Guanni Qu for detecting & reporting the issue

Author: mm2

src/cmslut.c

@@ -468,12 +468,12 @@ cmsUInt32Number CubeSize(const cmsUInt32Number Dims[], cmsUInt32Number b)
     for (rv = 1; b > 0; b--) {
 
         dim = Dims[b-1];
-        if (dim <= 1) return 0;  // Error
-
-        rv *= dim;
+        if (dim <= 1) return 0;  
 
         // Check for overflow
         if (rv > UINT_MAX / dim) return 0;
+
+        rv *= dim;
     }
 
     // Again, prevent overflow