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/ArrayLengthTest.java

@@ -0,0 +1,90 @@
+/*
+ * 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
+ * @run junit/othervm -ea -esa test.java.lang.invoke.ArrayLengthTest
+ */
+package test.java.lang.invoke;
+
+import java.lang.invoke.MethodHandle;
+import java.lang.invoke.MethodHandles;
+
+import org.junit.jupiter.api.Test;
+import org.junit.jupiter.params.ParameterizedTest;
+import org.junit.jupiter.params.provider.MethodSource;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+import static org.junit.jupiter.api.Assertions.assertThrows;
+
+public class ArrayLengthTest {
+
+    static Object[] arrayClasses() {
+        return new Object[] {
+                int[].class,
+                long[].class,
+                float[].class,
+                double[].class,
+                boolean[].class,
+                byte[].class,
+                short[].class,
+                char[].class,
+                Object[].class,
+                StringBuffer[].class
+        };
+    }
+
+    @ParameterizedTest
+    @MethodSource("arrayClasses")
+    public void testArrayLength(Class<?> arrayClass) throws Throwable {
+        MethodHandle arrayLength = MethodHandles.arrayLength(arrayClass);
+        assertEquals(int.class, arrayLength.type().returnType());
+        assertEquals(arrayClass, arrayLength.type().parameterType(0));
+        Object array = MethodHandles.arrayConstructor(arrayClass).invoke(10);
+        assertEquals(10, arrayLength.invoke(array));
+    }
+
+    @ParameterizedTest
+    @MethodSource("arrayClasses")
+    public void testArrayLengthInvokeNPE(Class<?> arrayClass) throws Throwable {
+        MethodHandle arrayLength = MethodHandles.arrayLength(arrayClass);
+        assertThrows(NullPointerException.class, () -> arrayLength.invoke(null));
+    }
+
+    @Test
+    public void testArrayLengthNoArray() {
+        assertThrows(IllegalArgumentException.class, () -> MethodHandles.arrayLength(String.class));
+    }
+
+    @Test
+    public void testArrayLengthNPE() {
+        assertThrows(NullPointerException.class, () -> MethodHandles.arrayLength(null));
+    }
+
+    @Test
+    public void testNullReference() throws Throwable {
+        MethodHandle arrayLength = MethodHandles.arrayLength(String[].class);
+        assertThrows(NullPointerException.class, () -> {
+            int len = (int)arrayLength.invokeExact((String[])null);
+        });
+    }
+}