Merge 138863

Source/WebCore/xml/parser/XMLDocumentParserLibxml2.cpp

 /*
  * Copyright (C) 2000 Peter Kelly <pmk@post.com>
  * Copyright (C) 2005, 2006, 2008 Apple Inc. All rights reserved.
  * Copyright (C) 2006 Alexey Proskuryakov <ap@webkit.org>
  * Copyright (C) 2007 Samuel Weinig <sam@webkit.org>
  * Copyright (C) 2008 Nokia Corporation and/or its subsidiary(-ies)
  * Copyright (C) 2008 Holger Hans Peter Freyther
  * Copyright (C) 2008, 2009 Torch Mobile Inc. All rights reserved. (http://www.torchmobile.com/)
  * Copyright (C) 2010 Patrick Gansterer <paroga@paroga.com>
  *
@@ skipping 1320 matching lines @@
     bool xmlViewerMode = !m_sawError && !m_sawCSS && !m_sawXSLTransform && xmlTreeViewer.hasNoStyleInformation();
     if (xmlViewerMode)
         xmlTreeViewer.transformDocumentToTreeView();
 
     if (m_sawXSLTransform) {
         void* doc = xmlDocPtrForString(document()->cachedResourceLoader(), m_originalSourceForTransform.toString(), document()->url().string());
         document()->setTransformSource(adoptPtr(new TransformSource(doc)));
 
         document()->setParsing(false); // Make the document think it's done, so it will apply XSL stylesheets.
         document()->styleResolverChanged(RecalcStyleImmediately);
+
+        // styleResolverChanged() call can detach the parser and null out its document.
+        // In that case, we just bail out.
+        if (isDetached())
+            return;
+
         document()->setParsing(true);
-
         DocumentParser::stopParsing();
     }
 #endif
 }
 
 #if ENABLE(XSLT)
 void* xmlDocPtrForString(CachedResourceLoader* cachedResourceLoader, const String& source, const String& url)
 {
     if (source.isEmpty())
         return 0;
@@ skipping 138 matching lines @@
     sax.startElementNs = attributesStartElementNsHandler;
     sax.initialized = XML_SAX2_MAGIC;
     RefPtr<XMLParserContext> parser = XMLParserContext::createStringParser(&sax, &state);
     String parseString = "<?xml version=\"1.0\"?><attrs " + string + " />";
     xmlParseChunk(parser->context(), reinterpret_cast<const char*>(parseString.characters()), parseString.length() * sizeof(UChar), 1);
     attrsOK = state.gotAttributes;
     return state.attributes;
 }
 
 }