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/io/ByteArrayOutputStream/EncodingTest.java

@@ -0,0 +1,87 @@
+/*
+ * Copyright (c) 2017, 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.
+ */
+
+import java.io.ByteArrayOutputStream;
+import java.io.IOException;
+import java.nio.charset.Charset;
+import java.nio.charset.StandardCharsets;
+import java.util.stream.Stream;
+
+import org.junit.jupiter.params.ParameterizedTest;
+import org.junit.jupiter.params.provider.Arguments;
+import org.junit.jupiter.params.provider.MethodSource;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+
+/**
+ * @test
+ * @bug 8183743
+ * @summary Test to verify the new overload method with Charset functions the same
+ * as the existing method that takes a charset name.
+ * @run junit EncodingTest
+ */
+public class EncodingTest {
+    /*
+     * MethodSource for the toString method test. Provides the following fields:
+     * byte array, charset name string, charset object
+     */
+    public static Stream<Arguments> parameters() throws IOException {
+        byte[] data = getData();
+        return Stream.of
+            (Arguments.of(data, StandardCharsets.UTF_8.name(), StandardCharsets.UTF_8),
+             Arguments.of(data, StandardCharsets.ISO_8859_1.name(), StandardCharsets.ISO_8859_1));
+    }
+
+    /**
+     * Verifies that the new overload method that takes a Charset is equivalent to
+     * the existing one that takes a charset name.
+     * @param data a byte array
+     * @param csn the charset name
+     * @param charset the charset
+     * @throws Exception if the test fails
+     */
+    @ParameterizedTest
+    @MethodSource("parameters")
+    public void test(byte[] data, String csn, Charset charset) throws Exception {
+        ByteArrayOutputStream baos = new ByteArrayOutputStream();
+        baos.write(data);
+        String str1 = baos.toString(csn);
+        String str2 = baos.toString(charset);
+        assertEquals(str2, str1);
+    }
+
+    /*
+     * Returns an array containing a character that's invalid for UTF-8
+     * but valid for ISO-8859-1
+     */
+    static byte[] getData() throws IOException {
+        String str1 = "A string that contains ";
+        String str2 = " , an invalid character for UTF-8.";
+
+        ByteArrayOutputStream baos = new ByteArrayOutputStream();
+        baos.write(str1.getBytes());
+        baos.write(0xFA);
+        baos.write(str2.getBytes());
+        return baos.toByteArray();
+    }
+}