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/lang/invoke/ConstantIdentityMHTest.java

@@ -0,0 +1,79 @@
+/*
+ * Copyright (c) 2016, 2026, 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 unit tests for java.lang.invoke.MethodHandles
+ * @run junit/othervm -ea -esa test.java.lang.invoke.ConstantIdentityMHTest
+ */
+package test.java.lang.invoke;
+
+import java.lang.invoke.MethodHandle;
+import java.lang.invoke.MethodHandles;
+import static java.lang.invoke.MethodHandles.*;
+import static java.lang.invoke.MethodType.*;
+import static org.junit.jupiter.api.Assertions.*;
+import org.junit.jupiter.api.Test;
+import org.junit.jupiter.params.ParameterizedTest;
+import org.junit.jupiter.params.provider.MethodSource;
+
+public class ConstantIdentityMHTest {
+
+    private static Object[][] testZeroData() {
+       return new Object[][] {
+           {void.class, "()void"},
+           {int.class, "()int"},
+           {byte.class, "()byte"},
+           {short.class, "()short"},
+           {long.class, "()long"},
+           {float.class, "()float"},
+           {double.class, "()double"},
+           {boolean.class, "()boolean"},
+           {char.class, "()char"},
+           {Integer.class, "()Integer"}
+       };
+    }
+
+    @ParameterizedTest
+    @MethodSource("testZeroData")
+    public void testZero(Class<?> expectedtype, String expected) throws Throwable {
+        assertEquals(expected, MethodHandles.zero(expectedtype).type().toString());
+    }
+
+    @Test
+    public void testZeroNPE() {
+        assertThrows(NullPointerException.class, () -> MethodHandles.zero(null));
+    }
+
+    @Test
+    void testEmpty() throws Throwable {
+        MethodHandle cat = lookup().findVirtual(String.class, "concat", methodType(String.class, String.class));
+        assertEquals("xy", (String)cat.invoke("x","y"));
+        MethodHandle mhEmpty = MethodHandles.empty(cat.type());
+        assertNull((String) mhEmpty.invoke("x", "y"));
+    }
+
+    @Test
+    void testEmptyNPE() {
+        assertThrows(NullPointerException.class, () -> MethodHandles.empty(null));
+    }
+}