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

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.

test/jdk/java/awt/event/StressTest/LargeAWTEventMulticasterTest.java

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+/*
+ * Copyright (c) 2024, 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.event.ActionListener;
+import java.awt.event.ActionEvent;
+import java.awt.AWTEventMulticaster;
+
+/*
+ * @test
+ * @bug 8342782
+ * @summary Tests large AWTEventMulticasters for StackOverflowErrors
+ * @run main LargeAWTEventMulticasterTest
+ */
+public class LargeAWTEventMulticasterTest {
+
+    /**
+     * This is an empty ActionListener that also has a numeric index.
+     */
+    static class IndexedActionListener implements ActionListener {
+        private final int index;
+
+        public IndexedActionListener(int index) {
+            this.index = index;
+        }
+
+        @Override
+        public void actionPerformed(ActionEvent e) {
+
+        }
+
+        public int getIndex() {
+            return index;
+        }
+
+        @Override
+        public String toString() {
+            return Integer.toString(index);
+        }
+    }
+
+    public static void main(String[] args) {
+        int maxA = 0;
+        try {
+            for (int a = 1; a < 200_000; a *= 2) {
+                maxA = a;
+                testAddingActionListener(a);
+            }
+        } finally {
+            System.out.println("maximum a = " + maxA);
+        }
+    }
+
+    private static void testAddingActionListener(int numberOfListeners) {
+        // step 1: create the large AWTEventMulticaster
+        ActionListener l = null;
+        for (int a = 0; a < numberOfListeners; a++) {
+            l = AWTEventMulticaster.add(l, new IndexedActionListener(a));
+        }
+
+        // Prior to 8342782 we could CREATE a large AWTEventMulticaster, but we couldn't
+        // always interact with it.
+
+        // step 2: dispatch an event
+        // Here we're making sure we don't get a StackOverflowError when we traverse the tree:
+        l.actionPerformed(null);
+
+        // step 3: make sure getListeners() returns elements in the correct order
+        // The resolution for 8342782 introduced a `rebalance` method; we want to
+        // double-check that the rebalanced tree preserves the appropriate order.
+        IndexedActionListener[] array = AWTEventMulticaster.getListeners(l, IndexedActionListener.class);
+        for (int b = 0; b < array.length; b++) {
+            if (b != array[b].getIndex())
+                throw new Error("the listeners are in the wrong order. " + b + " != " + array[b].getIndex());
+        }
+    }
+}