--- a/jdk/src/java.desktop/share/classes/sun/swing/JLightweightFrame.java	Sat Dec 10 14:57:06 2016 +0300
+++ b/jdk/src/java.desktop/share/classes/sun/swing/JLightweightFrame.java	Mon Dec 12 12:26:54 2016 +0300
@@ -305,6 +305,12 @@
             int startY = (int)Math.floor(y * scaleY);
             int width  = (int)Math.ceil((x + w) * scaleX) - startX;
             int height = (int)Math.ceil((y + h) * scaleY) - startY;
+            if (startX + width > linestride) {
+                width = linestride - startX;
+            }
+            if (startY + height > bbImage.getHeight()) {
+                height = bbImage.getHeight() - startY;
+            }
 
             for (int i = 0; i < height; i++) {
                 int from = (startY + i) * linestride + startX;

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/jdk/test/javax/swing/JLightweightFrame/JLightweightFrameRoundTest.java	Mon Dec 12 12:26:54 2016 +0300
@@ -0,0 +1,87 @@
+/*
+ * Copyright (c) 2016, 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 8170387
+ * @summary JLightweightFrame#syncCopyBuffer() may throw IOOBE
+ * @modules java.desktop/sun.swing
+ * @run main JLightweightFrameRoundTest
+ */
+
+import sun.swing.JLightweightFrame;
+import sun.swing.LightweightContent;
+
+import javax.swing.*;
+
+public class JLightweightFrameRoundTest {
+    public static void main(String[] args) throws Exception {
+        SwingUtilities.invokeAndWait(() -> {
+            JLightweightFrame jLightweightFrame = new JLightweightFrame();
+            jLightweightFrame.setContent(new XLightweightContent());
+            jLightweightFrame.setSize(600, 600);
+            jLightweightFrame.notifyDisplayChanged(1.0001, 1.0001);
+        });
+    }
+
+    static class XLightweightContent implements LightweightContent {
+        @Override
+        public JComponent getComponent() {
+            return new JPanel();
+        }
+
+        @Override
+        public void paintLock() {}
+
+        @Override
+        public void paintUnlock() {}
+
+        @Override
+        public void imageBufferReset(int[] data, int x, int y, int width,
+                                     int height, int linestride,
+                                     double scaleX,
+                                     double scaleY) {}
+
+        @Override
+        public void imageReshaped(int x, int y, int width, int height) {}
+
+        @Override
+        public void imageUpdated(int dirtyX, int dirtyY, int dirtyWidth,
+                                 int dirtyHeight) {}
+
+        @Override
+        public void focusGrabbed() {}
+
+        @Override
+        public void focusUngrabbed() {}
+
+        @Override
+        public void preferredSizeChanged(int width, int height) {}
+
+        @Override
+        public void maximumSizeChanged(int width, int height) {}
+
+        @Override
+        public void minimumSizeChanged(int width, int height) {}
+    }
+}