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/DataInputStream/SkipBytes.java

@@ -0,0 +1,87 @@
+/*
+ * Copyright (c) 1997, 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 4085938
+   @summary Check for the correct behaviour of DataInputStream.skipBytes
+   */
+
+import java.io.*;
+
+public class SkipBytes{
+
+    private static void dotest(DataInputStream dis, int pos, int total,
+                               int toskip, int expected) {
+
+        try {
+            System.err.println("\n\nTotal bytes in the stream = " + total);
+            System.err.println("Currently at position = " + pos);
+            System.err.println("Bytes to skip = " + toskip);
+            System.err.println("Expected result = " + expected);
+            int skipped = dis.skipBytes(toskip);
+            System.err.println("Actual skipped = " + skipped);
+            if (skipped != expected) {
+                throw new RuntimeException
+                    ("DataInputStream.skipBytes does not return expected value");
+            }
+        } catch(EOFException e){
+            throw new RuntimeException
+                ("DataInputStream.skipBytes throws unexpected EOFException");
+        } catch (IOException e) {
+            System.err.println("IOException is thrown - possible result");
+        }
+
+
+    }
+
+
+
+    public static void main(String args[]) throws Exception {
+
+        DataInputStream dis = new DataInputStream(new MyInputStream());
+        dotest(dis, 0, 11, -1, 0);
+        dotest(dis, 0, 11, 5, 5);
+        System.err.println("\n***CAUTION**** - may go into an infinite loop");
+        dotest(dis, 5, 11, 20, 6);
+    }
+}
+
+
+class MyInputStream extends InputStream {
+
+    private int readctr = 0;
+
+    public int read() {
+
+        if (readctr > 10){
+            return -1;
+        }
+        else{
+            readctr++;
+            return 0;
+        }
+
+    }
+
+    public int available() { return 0; }
+}