Fix out-of-memory crashes related to ArrayBuffer allocation

third_party/WebKit/Source/web/ServiceWorkerGlobalScopeProxy.cpp

 /*
  * Copyright (C) 2013 Google 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:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 133 matching lines @@
     if (0 <= actionIndex && actionIndex < static_cast<int>(data.actions.size()))
         eventInit.setAction(data.actions[actionIndex].action);
     RefPtrWillBeRawPtr<Event> event(NotificationEvent::create(EventTypeNames::notificationclick, eventInit, observer));
     m_workerGlobalScope->dispatchExtendableEvent(event.release(), observer);
 }
 
 void ServiceWorkerGlobalScopeProxy::dispatchPushEvent(int eventID, const WebString& data)
 {
     ASSERT(m_workerGlobalScope);
     WaitUntilObserver* observer = WaitUntilObserver::create(m_workerGlobalScope, WaitUntilObserver::Push, eventID);
-    RefPtrWillBeRawPtr<Event> event(PushEvent::create(EventTypeNames::push, PushMessageData::create(data), observer));
-    m_workerGlobalScope->dispatchExtendableEvent(event.release(), observer);
+    NonThrowableExceptionState exceptionState;
+    PushMessageData* messageData = PushMessageData::create(data, exceptionState);
+    // Fail silently by dropping the event when the allocation of PushMessageData fails (out of memory), which results in an exception
+    if (!exceptionState.hadException()) {
+        RefPtrWillBeRawPtr<Event> event(PushEvent::create(EventTypeNames::push, messageData, observer));
+        m_workerGlobalScope->dispatchExtendableEvent(event.release(), observer);
+    }
 }
 
 void ServiceWorkerGlobalScopeProxy::dispatchServicePortConnectEvent(WebServicePortConnectEventCallbacks* rawCallbacks, const WebURL& targetURL, const WebString& origin, WebServicePortID portID)
 {
     ASSERT(m_workerGlobalScope);
     OwnPtr<WebServicePortConnectEventCallbacks> callbacks = adoptPtr(rawCallbacks);
     ServicePortCollection* collection = WorkerNavigatorServices::services(m_workerGlobalScope, *m_workerGlobalScope->navigator());
     collection->dispatchConnectEvent(callbacks.release(), targetURL, origin, portID);
 }
 
@@ skipping 74 matching lines @@
 ServiceWorkerGlobalScopeProxy::ServiceWorkerGlobalScopeProxy(WebEmbeddedWorkerImpl& embeddedWorker, Document& document, WebServiceWorkerContextClient& client)
     : m_embeddedWorker(embeddedWorker)
     , m_document(document)
     , m_documentURL(document.url().copy())
     , m_client(client)
     , m_workerGlobalScope(nullptr)
 {
 }
 
 } // namespace blink