Merge 105524 - Crash in xsltParseGlobalVariable.

Source/WebCore/xml/XSLTProcessorLibxslt.cpp

 /*
  * This file is part of the XSL implementation.
  *
  * Copyright (C) 2004, 2005, 2006, 2007, 2008 Apple, Inc. All rights reserved.
  * Copyright (C) 2005, 2006 Alexey Proskuryakov <ap@webkit.org>
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
  * License as published by the Free Software Foundation; either
  * version 2 of the License, or (at your option) any later version.
@@ skipping 289 matching lines @@
 }
 
 bool XSLTProcessor::transformToString(Node* sourceNode, String& mimeType, String& resultString, String& resultEncoding)
 {
     RefPtr<Document> ownerDocument = sourceNode->document();
 
     setXSLTLoadCallBack(docLoaderFunc, this, ownerDocument->cachedResourceLoader());
     xsltStylesheetPtr sheet = xsltStylesheetPointer(m_stylesheet, m_stylesheetRootNode.get());
     if (!sheet) {
         setXSLTLoadCallBack(0, 0, 0);
+        m_stylesheet = 0;
         return false;
     }
     m_stylesheet->clearDocuments();
 
     xmlChar* origMethod = sheet->method;
     if (!origMethod && mimeType == "text/html")
         sheet->method = (xmlChar*)"html";
 
     bool success = false;
     bool shouldFreeSourceDoc = false;
@@ skipping 46 matching lines @@
     setXSLTLoadCallBack(0, 0, 0);
     xsltFreeStylesheet(sheet);
     m_stylesheet = 0;
 
     return success;
 }
 
 } // namespace WebCore
 
 #endif // ENABLE(XSLT)