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.

src/jdk.httpserver/share/classes/sun/net/httpserver/UndefLengthOutputStream.java

@@ -0,0 +1,82 @@
+/*
+ * Copyright (c) 2007, 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.  Oracle designates this
+ * particular file as subject to the "Classpath" exception as provided
+ * by Oracle in the LICENSE file that accompanied this code.
+ *
+ * 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.
+ */
+
+package sun.net.httpserver;
+
+import java.io.*;
+import java.util.Objects;
+
+/**
+ * a class which allows the caller to write an indefinite
+ * number of bytes to an underlying stream , but without using
+ * chunked encoding. Used for http/1.0 clients only
+ * The underlying connection needs to be closed afterwards.
+ */
+
+class UndefLengthOutputStream extends FilterOutputStream
+{
+    private boolean closed = false;
+    ExchangeImpl t;
+
+    UndefLengthOutputStream(ExchangeImpl t, OutputStream src) {
+        super(src);
+        this.t = t;
+    }
+
+    public void write(int b) throws IOException {
+        if (closed) {
+            throw new IOException("stream closed");
+        }
+        out.write(b);
+    }
+
+    public void write(byte[] b, int off, int len) throws IOException {
+        Objects.checkFromIndexSize(off, len, b.length);
+        if (len == 0) {
+            return;
+        }
+        if (closed) {
+            throw new IOException("stream closed");
+        }
+        out.write(b, off, len);
+    }
+
+    public void close() throws IOException {
+        if (closed) {
+            return;
+        }
+        closed = true;
+        flush();
+        LeftOverInputStream is = t.getOriginalInputStream();
+        if (!is.isClosed()) {
+            try {
+                is.close();
+            } catch (IOException e) {}
+        }
+        t.postExchangeFinished(true);
+    }
+
+    // flush is a pass-through
+}