Guard ResourceLoader::didReceiveData in error case.

Source/core/loader/ResourceLoader.cpp

 /*
  * Copyright (C) 2006, 2007, 2010, 2011 Apple Inc. All rights reserved.
  *           (C) 2007 Graham Dennis (graham.dennis@gmail.com)
  *
  * 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. 
@@ skipping 336 matching lines @@
 
     if (m_resource->response().httpStatusCode() < 400 || m_resource->shouldIgnoreHTTPStatusCodeErrors())
         return;
     m_state = Finishing;
     m_resource->error(CachedResource::LoadError);
     cancel();
 }
 
 void ResourceLoader::didReceiveData(ResourceHandle*, const char* data, int length, int encodedDataLength)
 {
+    // It is possible to receive data on uninitialized resources if it had an error status code, and we are running a nested message
+    // loop. When this occurs, ignoring the data is the correct action.
+    if (m_resource->response().httpStatusCode() >= 400 && !m_resource->shouldIgnoreHTTPStatusCodeErrors())
+        return;
     InspectorInstrumentationCookie cookie = InspectorInstrumentation::willReceiveResourceData(m_frame.get(), identifier(), encodedDataLength);
     ASSERT(m_state == Initialized);
 
     // Reference the object in this method since the additional processing can do
     // anything including removing the last reference to this object.
     RefPtr<ResourceLoader> protect(this);
 
     // FIXME: If we get a resource with more than 2B bytes, this code won't do the right thing.
     // However, with today's computers and networking speeds, this won't happen in practice.
     // Could be an issue with a giant local file.
@@ skipping 57 matching lines @@
     info.addMember(m_request, "request");
     info.addMember(m_originalRequest, "originalRequest");
     info.addMember(m_deferredRequest, "deferredRequest");
     info.addMember(m_options, "options");
     info.addMember(m_resource, "resource");
     info.addMember(m_documentLoader, "documentLoader");
     info.addMember(m_requestCountTracker, "requestCountTracker");
 }
 
 }