--- a/nashorn/src/jdk/nashorn/internal/objects/NativeRegExp.java	Wed Sep 25 08:17:37 2013 +0530
+++ b/nashorn/src/jdk/nashorn/internal/objects/NativeRegExp.java	Wed Sep 25 16:37:56 2013 +0200
@@ -883,7 +883,7 @@
      * @return last index property as int
      */
     public int getLastIndex() {
-        return JSType.toInt32(lastIndex);
+        return JSType.toInteger(lastIndex);
     }
 
     /**

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/nashorn/test/script/basic/JDK-8025434.js	Wed Sep 25 16:37:56 2013 +0200
@@ -0,0 +1,66 @@
+/*
+ * Copyright (c) 2010, 2013, Oracle and/or its affiliates. All rights reserved.
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ * 
+ * This code is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 only, as
+ * published by the Free Software Foundation.
+ * 
+ * This code is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ * 
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ * 
+ * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
+ * or visit www.oracle.com if you need additional information or have any
+ * questions.
+ */
+
+/**
+ * JDK-8025434: RegExp lastIndex can exceed int range
+ *
+ * @test
+ * @run
+ */
+
+var r = /a/g;
+
+r.lastIndex = 0x100000000;
+if (r.test("a")) {
+    throw new Error("Expected no match");
+}
+
+r.lastIndex = 0x100000000000000;
+if (r.test("a")) {
+    throw new Error("Expected no match");
+}
+
+r.lastIndex = -0x100000000;
+if (r.test("a")) {
+    throw new Error("Expected match");
+}
+
+r.lastIndex = -0x100000000000000;
+if (r.test("a")) {
+    throw new Error("Expected no match");
+}
+
+r.lastIndex = 1;
+if (r.test("a")) {
+    throw new Error("Expected no match");
+}
+
+r.lastIndex = -1;
+if (r.test("a")) {
+    throw new Error("Expected no match");
+}
+
+r.lastIndex = 0;
+if (!r.test("a")) {
+    throw new Error("Expected match");
+}