Check that ExecutionContext and LocalFrame pointers are not null before getting shouldBypassMainWor…

Source/core/page/EventSource.cpp

 /*
  * Copyright (C) 2009, 2012 Ericsson AB. All rights reserved.
  * Copyright (C) 2010 Apple Inc. All rights reserved.
  * Copyright (C) 2011, Code Aurora Forum. 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
@@ skipping 69 matching lines @@
         return nullptr;
     }
 
     KURL fullURL = context->completeURL(url);
     if (!fullURL.isValid()) {
         exceptionState.throwDOMException(SyntaxError, "Cannot open an EventSource to '" + url + "'. The URL is invalid.");
         return nullptr;
     }
 
     // FIXME: Convert this to check the isolated world's Content Security Policy once webkit.org/b/104520 is solved.
-    bool shouldBypassMainWorldCSP = false;
-    if (context->isDocument()) {
-        Document* document = toDocument(context);
-        shouldBypassMainWorldCSP = document->frame()->script().shouldBypassMainWorldCSP();
-    }
-    if (!shouldBypassMainWorldCSP && !context->contentSecurityPolicy()->allowConnectToSource(fullURL)) {
+    if (!ContentSecurityPolicy::shouldBypassMainWorld(context) && !context->contentSecurityPolicy()->allowConnectToSource(fullURL)) {
         // We can safely expose the URL to JavaScript, as this exception is generate synchronously before any redirects take place.
         exceptionState.throwSecurityError("Refused to connect to '" + fullURL.elidedString() + "' because it violates the document's Content Security Policy.");
         return nullptr;
     }
 
     RefPtrWillBeRawPtr<EventSource> source = adoptRefWillBeNoop(new EventSource(context, fullURL, eventSourceInit));
 
     source->scheduleInitialConnect();
     source->suspendIfNeeded();
 
@@ skipping 327 matching lines @@
 
 PassRefPtrWillBeRawPtr<MessageEvent> EventSource::createMessageEvent()
 {
     RefPtrWillBeRawPtr<MessageEvent> event = MessageEvent::create();
     event->initMessageEvent(m_eventName.isEmpty() ? EventTypeNames::message : m_eventName, false, false, SerializedScriptValueFactory::instance().create(String(m_data)), m_eventStreamOrigin, m_lastEventId, 0, nullptr);
     m_data.clear();
     return event.release();
 }
 
 } // namespace blink