8011645: CopyOnWriteArrayList.COWSubList.subList does not validate range properly

Reviewed-by: martin, psandoz

src/share/classes/java/util/concurrent/CopyOnWriteArrayList.java

@@ -1400,7 +1400,7 @@ public class CopyOnWriteArrayList<E>
             lock.lock();
             try {
                 checkForComodification();
-                if (fromIndex < 0 || toIndex > size)
+                if (fromIndex < 0 || toIndex > size || fromIndex > toIndex)
                     throw new IndexOutOfBoundsException();
                 return new COWSubList<E>(l, fromIndex + offset,
                                          toIndex + offset);

test/java/util/concurrent/CopyOnWriteArrayList/COWSubList.java

+/*
+ * Copyright (c) 2014, 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.
+ */
+
+/*
+ * @test
+ * @bug 8011645
+ * @summary CopyOnWriteArrayList.COWSubList.subList does not validate range properly
+ */
+import java.util.List;
+import java.util.concurrent.CopyOnWriteArrayList;
+
+public class COWSubList {
+    public static void main(String[] args) {
+        List<String> list = new CopyOnWriteArrayList<>();
+        list.add("A");
+        list.add("B");
+        list.add("C");
+        list.add("D");
+        list.add("E");
+
+        expectThrow(() -> list.subList(-1, 5));
+        expectThrow(() -> list.subList(0, 6));
+        expectThrow(() -> list.subList(4, 3));
+        expectThrow(() -> list.subList(0, 5).subList(-1, 5));
+        expectThrow(() -> list.subList(0, 5).subList(0, 6));
+        expectThrow(() -> list.subList(0, 5).subList(4, 3));
+    }
+
+    static void expectThrow(Runnable r) {
+        try {
+            r.run();
+            throw new RuntimeException("Failed: expected IOOBE to be thrown");
+        } catch (IndexOutOfBoundsException x) {
+            // ok, excpeted
+        }
+    }
+}
+