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/com/sun/net/httpserver/bugs/ZeroLengthOutputStream.java

@@ -0,0 +1,118 @@
+/*
+ * Copyright (c) 2023, 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 com.sun.net.httpserver.HttpExchange;
+import com.sun.net.httpserver.HttpHandler;
+import com.sun.net.httpserver.HttpServer;
+import jdk.test.lib.net.URIBuilder;
+import org.junit.jupiter.api.Test;
+
+import java.io.IOException;
+import java.io.OutputStream;
+import java.net.HttpURLConnection;
+import java.net.InetAddress;
+import java.net.InetSocketAddress;
+import java.net.Proxy;
+import java.net.URL;
+import java.util.concurrent.CountDownLatch;
+import java.util.logging.ConsoleHandler;
+import java.util.logging.Handler;
+import java.util.logging.Level;
+import java.util.logging.Logger;
+
+import static org.junit.jupiter.api.Assertions.*;
+import static com.sun.net.httpserver.HttpExchange.RSPBODY_EMPTY;
+
+/*
+ * @test
+ * @bug 8219083
+ * @summary HttpExchange.getResponseBody write and close should not throw
+ *          even when response length is zero
+ * @library /test/lib
+ * @comment We use othervm because this test configures logging handlers
+ *          for the system wide "com.sun.net.httpserver" logger
+ * @run junit/othervm ${test.main.class}
+ */
+public class ZeroLengthOutputStream {
+
+    private static final Logger LOGGER = Logger.getLogger("com.sun.net.httpserver");
+    public volatile boolean closed;
+    public CountDownLatch cdl = new CountDownLatch(1);
+
+    @Test
+    void test() throws IOException, InterruptedException {
+        HttpServer httpServer = startHttpServer();
+        int port = httpServer.getAddress().getPort();
+        try {
+            URL url = URIBuilder.newBuilder()
+                .scheme("http")
+                .loopback()
+                .port(port)
+                .path("/flis/")
+                .toURLUnchecked();
+            HttpURLConnection uc = (HttpURLConnection)url.openConnection(Proxy.NO_PROXY);
+            uc.getResponseCode();
+            cdl.await();
+            assertTrue(closed, "OutputStream close did not complete");
+        } finally {
+            httpServer.stop(0);
+        }
+    }
+
+    private static void setupLogging() {
+        final Handler handler = new ConsoleHandler();
+        handler.setLevel(Level.FINEST);
+        LOGGER.setLevel(Level.FINEST);
+        LOGGER.addHandler(handler);
+    }
+
+    /**
+     * Http Server
+     */
+    HttpServer startHttpServer() throws IOException {
+        setupLogging(); // merely for debugging
+        InetAddress loopback = InetAddress.getLoopbackAddress();
+        HttpServer httpServer = HttpServer.create(new InetSocketAddress(loopback, 0), 0);
+        httpServer.createContext("/flis/", new MyHandler());
+        httpServer.start();
+        return httpServer;
+    }
+
+    class MyHandler implements HttpHandler {
+
+        @Override
+        public void handle(HttpExchange t) throws IOException {
+            try {
+                OutputStream os = t.getResponseBody();
+                t.sendResponseHeaders(200, RSPBODY_EMPTY);
+                os.write(new byte[0]);
+                os.close();
+                System.out.println("Output stream closed");
+                closed = true;
+            } finally {
+                cdl.countDown();
+            }
+        }
+    }
+}