--- a/src/share/classes/sun/security/util/DerIndefLenConverter.java	Fri Aug 01 13:58:29 2008 -0700
+++ b/src/share/classes/sun/security/util/DerIndefLenConverter.java	Wed Aug 06 08:11:49 2008 +0800
@@ -1,5 +1,5 @@
 /*
- * Copyright 1998-2006 Sun Microsystems, Inc.  All Rights Reserved.
+ * Copyright 1998-2008 Sun Microsystems, Inc.  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
@@ -50,6 +50,7 @@ class DerIndefLenConverter {
 
     private byte[] data, newData;
     private int newDataPos, dataPos, dataSize, index;
+    private int unresolved = 0;
 
     private ArrayList<Object> ndefsList = new ArrayList<Object>();
 
@@ -113,6 +114,7 @@ class DerIndefLenConverter {
                              numOfEncapsulatedLenBytes;
             byte[] sectionLenBytes = getLengthBytes(sectionLen);
             ndefsList.set(index, sectionLenBytes);
+            unresolved--;
 
             // Add the number of bytes required to represent this section
             // to the total number of length bytes,
@@ -149,6 +151,7 @@ class DerIndefLenConverter {
         int lenByte = data[dataPos++] & 0xff;
         if (isIndefinite(lenByte)) {
             ndefsList.add(new Integer(dataPos));
+            unresolved++;
             return curLen;
         }
         if (isLongForm(lenByte)) {
@@ -308,15 +311,21 @@ class DerIndefLenConverter {
         dataPos=0; index=0;
         dataSize = data.length;
         int len=0;
+        int unused = 0;
 
         // parse and set up the vectors of all the indefinite-lengths
         while (dataPos < dataSize) {
             parseTag();
             len = parseLength();
             parseValue(len);
-        }
-
-        newData = new byte[dataSize + numOfTotalLenBytes];
+            if (unresolved == 0) {
+                unused = dataSize - dataPos;
+                dataSize = dataPos;
+                break;
+            }
+        }
+
+        newData = new byte[dataSize + numOfTotalLenBytes + unused];
         dataPos=0; newDataPos=0; index=0;
 
         // write out the new byte array replacing all the indefinite-lengths
@@ -325,6 +334,8 @@ class DerIndefLenConverter {
            writeTag();
            writeLengthAndValue();
         }
+        System.arraycopy(indefData, dataSize,
+                         newData, dataSize + numOfTotalLenBytes, unused);
 
         return newData;
     }

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/test/sun/security/util/DerValue/Indefinite.java	Wed Aug 06 08:11:49 2008 +0800
@@ -0,0 +1,44 @@
+/*
+ * Copyright 2008 Sun Microsystems, Inc.  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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
+ * CA 95054 USA or visit www.sun.com if you need additional information or
+ * have any questions.
+ */
+
+/*
+ * @test
+ * @bug 6731685
+ * @summary CertificateFactory.generateCertificates throws IOException on PKCS7 cert chain
+ */
+
+import java.io.*;
+import sun.security.util.*;
+
+public class Indefinite {
+
+    public static void main(String[] args) throws Exception {
+        byte[] input = {
+            // An OCTET-STRING in 2 parts
+            4, (byte)0x80, 4, 2, 'a', 'b', 4, 2, 'c', 'd', 0, 0,
+            // Garbage follows, may be falsely recognized as EOC
+            0, 0, 0, 0
+        };
+        new DerValue(new ByteArrayInputStream(input));
+    }
+}