Fixed an integer overflow in OpenMapRealMatrix.

JIRA: MATH-679

git-svn-id: https://svn.apache.org/repos/asf/commons/proper/math/trunk@1181181 13f79535-47bb-0310-9956-ffa450edef68

src/main/java/org/apache/commons/math/linear/OpenMapRealMatrix.java

@@ -19,6 +19,7 @@ package org.apache.commons.math.linear;
 
 import java.io.Serializable;
 
+import org.apache.commons.math.exception.NumberIsTooLargeException;
 import org.apache.commons.math.util.OpenIntToDoubleHashMap;
 
 /**
@@ -46,6 +47,11 @@ public class OpenMapRealMatrix extends AbstractRealMatrix
      */
     public OpenMapRealMatrix(int rowDimension, int columnDimension) {
         super(rowDimension, columnDimension);
+        long lRow = (long) rowDimension;
+        long lCol = (long) columnDimension;
+        if (lRow * lCol >= (long) Integer.MAX_VALUE) {
+            throw new NumberIsTooLargeException(lRow * lCol, Integer.MAX_VALUE, false);
+        }
         this.rows = rowDimension;
         this.columns = columnDimension;
         this.entries = new OpenIntToDoubleHashMap(0.0);

src/site/xdoc/changes.xml

@@ -52,6 +52,9 @@ The <action> type attribute can be add,update,fix,remove.
     If the output is not quite correct, check for invisible trailing spaces!
      -->
     <release version="3.0" date="TBD" description="TBD">
+      <action dev="luc" type="fix" issue="MATH-679" due-to="Christopher Berner">
+         Fixed an integer overflow in OpenMapRealMatrix.
+      </action>
       <action dev="erans" type="fix" issue="MATH-688">
         "FastMath": Use constant fields instead of recomputing them at method
         call.

src/test/java/org/apache/commons/math/linear/OpenMapRealMatrixTest.java

@@ -0,0 +1,29 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License.  You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.apache.commons.math.linear;
+
+import org.apache.commons.math.exception.NumberIsTooLargeException;
+import org.junit.Test;
+
+public final class OpenMapRealMatrixTest {
+
+    @Test(expected=NumberIsTooLargeException.class)
+    public void testMath679() {
+        new OpenMapRealMatrix(3, Integer.MAX_VALUE);
+    }
+
+}