Should check if XMLReader is created successfully.

git-svn-id: https://svn.apache.org/repos/asf/xerces/c/trunk@173549 13f79535-47bb-0310-9956-ffa450edef68

src/xercesc/internal/ReaderMgr.cpp

 /*
  * The Apache Software License, Version 1.1
- * 
+ *
  * Copyright (c) 1999-2000 The Apache Software Foundation.  All rights
  * reserved.
- * 
+ *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
- * 
+ *
  * 1. Redistributions of source code must retain the above copyright
- *    notice, this list of conditions and the following disclaimer. 
- * 
+ *    notice, this list of conditions and the following disclaimer.
+ *
  * 2. Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in
  *    the documentation and/or other materials provided with the
  *    distribution.
- * 
+ *
  * 3. The end-user documentation included with the redistribution,
- *    if any, must include the following acknowledgment:  
+ *    if any, must include the following acknowledgment:
  *       "This product includes software developed by the
  *        Apache Software Foundation (http://www.apache.org/)."
  *    Alternately, this acknowledgment may appear in the software itself,
  *    if and wherever such third-party acknowledgments normally appear.
- * 
+ *
  * 4. The names "Xerces" and "Apache Software Foundation" must
  *    not be used to endorse or promote products derived from this
- *    software without prior written permission. For written 
+ *    software without prior written permission. For written
  *    permission, please contact apache\@apache.org.
- * 
+ *
  * 5. Products derived from this software may not be called "Apache",
  *    nor may "Apache" appear in their name, without prior written
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- * 
+ *
  * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
  * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
@@ -45,7 +45,7 @@
  * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  * SUCH DAMAGE.
  * ====================================================================
- * 
+ *
  * This software consists of voluntary contributions made by many
  * individuals on behalf of the Apache Software Foundation, and was
  * originally based on software copyright (c) 1999, International
@@ -427,10 +427,10 @@ XMLReader* ReaderMgr::createReader( const   InputSource&        src
     //
     XMLReader* retVal = 0;
 
-    // XMLReader ctor invokes refreshRawBuffer() which calls 
+    // XMLReader ctor invokes refreshRawBuffer() which calls
     // newStream->readBytes().
-    // This readBytes() may throw exception, which neither 
-    // refresRawBuffer(), nor XMLReader ctor catches. 
+    // This readBytes() may throw exception, which neither
+    // refresRawBuffer(), nor XMLReader ctor catches.
     // We need to handle this exception to avoid leak on newStream.
 
     try {
@@ -467,6 +467,12 @@ XMLReader* ReaderMgr::createReader( const   InputSource&        src
         throw;
     }
 
+    // If it failed for any reason, then return zero.
+    if (!retVal) {
+        delete newStream;
+        return 0;
+    }
+
     // Set the next available reader number on this reader
     retVal->setReaderNum(fNextReaderNum++);
     return retVal;
@@ -588,23 +594,33 @@ ReaderMgr::createIntEntReader(  const   XMLCh* const        sysId
     //  as a 'do nothing' transcoder for the already internalized XMLCh
     //  data that makes up an internal entity.
     //
+    BinMemInputStream* newStream = new BinMemInputStream
+                                   (
+                                     (const XMLByte*)dataBuf
+                                     , dataLen * sizeof(XMLCh)
+                                     , copyBuf ? BinMemInputStream::BufOpt_Copy
+                                                 : BinMemInputStream::BufOpt_Reference
+                                   );
+    if (!newStream)
+        return 0;
+
     XMLReader* retVal = new XMLReader
     (
         sysId
         , 0
-        , new BinMemInputStream
-          (
-            (const XMLByte*)dataBuf
-            , dataLen * sizeof(XMLCh)
-            , copyBuf ? BinMemInputStream::BufOpt_Copy
-                        : BinMemInputStream::BufOpt_Reference
-          )
+        , newStream
         , XMLUni::fgXMLChEncodingString
         , refFrom
         , type
         , XMLReader::Source_Internal
     );
 
+    // If it failed for any reason, then return zero.
+    if (!retVal) {
+        delete newStream;
+        return 0;
+    }
+
     // Set the reader number to the next available number
     retVal->setReaderNum(fNextReaderNum++);
     return retVal;