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undefect. CWE-407 — 63 sites patched across 27 ecosystems

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Authors: russell@unturf.com · brackishbert@gmail.com · foxhop.net · TimeHexOn.com

Patches, unit tests, benchmarks, whitepaper, and outreach briefs.
Public domain — no copyright claimed. Use freely.
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russell@unturf.com 2026-03-26 17:11:57 -04:00
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test/jdk/java/awt/image/multiresolution/ImageObserverLeak.java Normal file
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/*
* Copyright (c) 2021, 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.
*/
import java.awt.Graphics2D;
import java.awt.Image;
import java.awt.image.BaseMultiResolutionImage;
import java.awt.image.BufferedImage;
import java.awt.image.ImageObserver;
import java.lang.ref.Reference;
import java.lang.ref.WeakReference;
import static java.awt.image.BufferedImage.TYPE_INT_RGB;
/**
* @test
* @bug 8257500
* @summary Drawing MultiResolutionImage with ImageObserver may "leaks" memory
*/
public final class ImageObserverLeak {
public static void main(String[] args) throws Exception {
Reference<ImageObserver> ref = test();
while (!ref.refersTo(null)) {
Thread.sleep(500);
// Cannot generate OOM here, it will clear the SoftRefs as well
System.gc();
}
}
private static Reference<ImageObserver> test() throws Exception {
BufferedImage src = new BufferedImage(200, 200, TYPE_INT_RGB);
Image mri = new BaseMultiResolutionImage(src);
ImageObserver observer = new ImageObserver() {
@Override
public boolean imageUpdate(Image img, int infoflags, int x, int y,
int width, int height) {
return false;
}
};
Reference<ImageObserver> ref = new WeakReference<>(observer);
BufferedImage dst = new BufferedImage(200, 300, TYPE_INT_RGB);
Graphics2D g2d = dst.createGraphics();
g2d.drawImage(mri, 0, 0, observer);
g2d.dispose();
return ref;
}
}