Merge 132287 - Crash in WebCore::SubresourceLoader::willSendRequest.

Source/WebCore/loader/SubresourceLoader.cpp

 /*
  * Copyright (C) 2006, 2007, 2009 Apple Inc. 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. 
  * 2.  Redistributions in binary form must reproduce the above copyright
@@ skipping 146 matching lines @@
 
 bool SubresourceLoader::isSubresourceLoader()
 {
     return true;
 }
 
 void SubresourceLoader::willSendRequest(ResourceRequest& newRequest, const ResourceResponse& redirectResponse)
 {
     // Store the previous URL because the call to ResourceLoader::willSendRequest will modify it.
     KURL previousURL = request().url();
+    RefPtr<SubresourceLoader> protect(this);
     
     ResourceLoader::willSendRequest(newRequest, redirectResponse);
     if (!previousURL.isNull() && !newRequest.isNull() && previousURL != newRequest.url()) {
         if (!m_document->cachedResourceLoader()->canRequest(m_resource->type(), newRequest.url())) {
             cancel();
             return;
         }
         m_resource->willSendRequest(newRequest, redirectResponse);
     }
 }
@@ skipping 163 matching lines @@
         if (reachedTerminalState())
             return;
         m_resource->stopLoading();
         m_documentLoader->removeSubresourceLoader(this);
     }
     m_document = 0;
     ResourceLoader::releaseResources();
 }
 
 }