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/InputStream/NullInputStream.java

@@ -0,0 +1,168 @@
+/*
+ * Copyright (c) 2018, 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.EOFException;
+import java.io.IOException;
+import java.io.InputStream;
+
+import org.junit.jupiter.api.AfterAll;
+import org.junit.jupiter.api.BeforeAll;
+import org.junit.jupiter.api.Test;
+
+import static org.junit.jupiter.api.Assertions.assertDoesNotThrow;
+import static org.junit.jupiter.api.Assertions.assertEquals;
+import static org.junit.jupiter.api.Assertions.assertNotNull;
+import static org.junit.jupiter.api.Assertions.assertThrows;
+
+/*
+ * @test
+ * @bug 4358774 6516099 8139206
+ * @run junit NullInputStream
+ * @summary Check for expected behavior of InputStream.nullInputStream().
+ */
+public class NullInputStream {
+    private static InputStream openStream;
+    private static InputStream closedStream;
+
+    @BeforeAll
+    public static void setup() {
+        openStream = InputStream.nullInputStream();
+        closedStream = InputStream.nullInputStream();
+        assertDoesNotThrow(() -> closedStream.close());
+    }
+
+    @AfterAll
+    public static void closeStream() {
+        assertDoesNotThrow(() -> openStream.close());
+    }
+
+    @Test
+    public void testOpen() {
+        assertNotNull(openStream, "InputStream.nullInputStream() returned null");
+    }
+
+    @Test
+    public void testAvailable() throws IOException {
+        assertEquals(0, openStream.available());
+    }
+
+    @Test
+    public void testRead() throws IOException {
+        assertEquals(-1, openStream.read());
+    }
+
+    @Test
+    public void testReadBII() throws IOException {
+        assertEquals(-1, openStream.read(new byte[1], 0, 1));
+    }
+
+    @Test
+    public void testReadAllBytes() throws IOException {
+        assertEquals(0, openStream.readAllBytes().length);
+    }
+
+    @Test
+    public void testReadNBytes() throws IOException {
+        assertEquals(0, openStream.readNBytes(new byte[1], 0, 1));
+    }
+
+    @Test
+    public void testReadNBytesWithLength() throws IOException {
+        assertThrows(IllegalArgumentException.class,
+                     () -> openStream.readNBytes(-1));
+        assertEquals(0, openStream.readNBytes(0).length);
+        assertEquals(0, openStream.readNBytes(1).length);
+    }
+
+    @Test
+    public void testSkip() throws IOException {
+        assertEquals(0L, openStream.skip(1));
+    }
+
+    @Test
+    public void testSkipNBytes() {
+        assertDoesNotThrow(() -> {
+                openStream.skipNBytes(-1);
+                openStream.skipNBytes(0);
+            });
+    }
+
+    @Test
+    public void testSkipNBytesEOF() throws IOException {
+        assertThrows(EOFException.class, () -> openStream.skipNBytes(1));
+    }
+
+    @Test
+    public void testTransferTo() throws IOException {
+        assertEquals(0L, openStream.transferTo(new ByteArrayOutputStream(7)));
+    }
+
+    @Test
+    public void testAvailableClosed() {
+        assertThrows(IOException.class, () -> closedStream.available());
+    }
+
+    @Test
+    public void testReadClosed() {
+        assertThrows(IOException.class, () -> closedStream.read());
+    }
+
+    @Test
+    public void testReadBIIClosed() {
+        assertThrows(IOException.class,
+                     () -> closedStream.read(new byte[1], 0, 1));
+    }
+
+    @Test
+    public void testReadAllBytesClosed() {
+        assertThrows(IOException.class, () -> closedStream.readAllBytes());
+    }
+
+    @Test
+    public void testReadNBytesClosed() {
+        assertThrows(IOException.class, () ->
+            closedStream.readNBytes(new byte[1], 0, 1));
+    }
+
+    @Test
+    public void testReadNBytesWithLengthClosed() {
+        assertThrows(IOException.class, () -> closedStream.readNBytes(1));
+    }
+
+    @Test
+    public void testSkipClosed() {
+        assertThrows(IOException.class, () -> closedStream.skip(1));
+    }
+
+    @Test
+    public void testSkipNBytesClosed() {
+        assertThrows(IOException.class, () -> closedStream.skipNBytes(1));
+    }
+
+    @Test
+    public void testTransferToClosed() {
+        assertThrows(IOException.class,
+            () -> closedStream.transferTo(new ByteArrayOutputStream(7)));
+    }
+}