overflow check from a constructor function.

Author: dreamer2368

lib/linalg/Matrix.cpp

@@ -130,6 +130,10 @@ Matrix::Matrix(
         memcpy(d_mat, mat, d_alloc_size*sizeof(double));
     }
     else {
+        // Check integer multiplication overflow
+        if (num_rows > INT_MAX / num_cols)
+            CAROM_ERROR("Matrix::setSize- new size exceeds maximum integer value!\n");
+            
         d_mat = mat;
         d_alloc_size = num_rows*num_cols;
         d_num_cols = num_cols;