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/langtools/tools/javac/lambda/methodReferenceExecution/MethodReferenceTestVarHandle.java

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+/*
+ * Copyright (c) 2020, 2025, 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
+ * @summary test for VarHandle signature polymorphic methods
+ * @run junit MethodReferenceTestVarHandle
+ */
+
+import java.lang.invoke.*;
+import java.util.*;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+import org.junit.jupiter.api.Test;
+
+public class MethodReferenceTestVarHandle {
+
+  interface Setter {
+      void apply(int[] arr, int idx, int val);
+  }
+
+  interface Getter {
+      int apply(int[] arr, int idx);
+  }
+
+    @Test
+  public void testSet() throws Throwable {
+      VarHandle vh = MethodHandles.arrayElementVarHandle(int[].class);
+
+      Setter f = vh::set;
+
+      int[] data = {0};
+      f.apply(data, 0, 42);
+      assertEquals(42, data[0]);
+  }
+
+    @Test
+  public void testGet() throws Throwable {
+      VarHandle vh = MethodHandles.arrayElementVarHandle(int[].class);
+
+      Getter f = vh::get;
+
+      int[] data = {42};
+      int v = f.apply(data, 0);
+      assertEquals(42, v);
+  }
+}