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/MethodHandlesCollectArgsTest.java

@@ -0,0 +1,81 @@
+/*
+ * Copyright (c) 2021, 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
+ * @bug 8259922
+ * @run junit/othervm MethodHandlesCollectArgsTest
+ */
+
+import java.lang.invoke.MethodHandle;
+import java.lang.invoke.MethodHandles;
+import java.lang.invoke.MethodType;
+import static java.lang.invoke.MethodType.methodType;
+
+import static org.junit.jupiter.api.Assertions.*;
+import org.junit.jupiter.params.ParameterizedTest;
+import org.junit.jupiter.params.provider.MethodSource;
+
+public class MethodHandlesCollectArgsTest {
+
+    private static final MethodHandle TARGET_II_I = MethodHandles.empty(methodType(int.class, int.class, int.class));
+    private static final MethodHandle TARGET__V = MethodHandles.empty(methodType(void.class));
+    private static final MethodHandle FILTER_INT = MethodHandles.empty(methodType(int.class, String.class));
+    private static final MethodHandle FILTER_VOID = MethodHandles.empty(methodType(void.class, String.class));
+
+    public static Object[][] illegalPos() {
+        return new Object[][] {
+            {TARGET_II_I, 2, FILTER_INT},
+            {TARGET_II_I, 3, FILTER_VOID},
+            {TARGET_II_I, -1, FILTER_INT},
+            {TARGET_II_I, -1, FILTER_VOID},
+            {TARGET__V, 0, FILTER_INT},
+            {TARGET__V, 1, FILTER_VOID},
+            {TARGET__V, -1, FILTER_VOID},
+            {TARGET__V, -1, FILTER_VOID}
+        };
+    }
+
+    public static Object[][] validPos() {
+        return new Object[][] {
+            {TARGET_II_I, 0, FILTER_INT, methodType(int.class, String.class, int.class)},
+            {TARGET_II_I, 1, FILTER_INT, methodType(int.class, int.class, String.class)},
+            {TARGET_II_I, 0, FILTER_VOID, methodType(int.class, String.class, int.class, int.class)},
+            {TARGET_II_I, 1, FILTER_VOID, methodType(int.class, int.class, String.class, int.class)},
+            {TARGET_II_I, 2, FILTER_VOID, methodType(int.class, int.class, int.class, String.class)},
+            {TARGET__V, 0, FILTER_VOID, methodType(void.class, String.class)}
+        };
+    }
+
+    @ParameterizedTest
+    @MethodSource("illegalPos")
+    public void illegalPosition(MethodHandle target, int position, MethodHandle filter) {
+        assertThrows(IllegalArgumentException.class, () -> MethodHandles.collectArguments(target, position, filter));
+    }
+
+    @ParameterizedTest
+    @MethodSource("validPos")
+    public void legalPosition(MethodHandle target, int position, MethodHandle filter, MethodType expectedType) {
+        MethodHandle result = MethodHandles.collectArguments(target, position, filter);
+        assertEquals(expectedType, result.type());
+    }
+}