Fix out-of-memory crashes related to ArrayBuffer allocation

third_party/WebKit/Source/modules/mediastream/RTCDataChannel.cpp

 /*
  * Copyright (C) 2012 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:
  * 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
  *     notice, this list of conditions and the following disclaimer in the
@@ skipping 269 matching lines @@
 void RTCDataChannel::didReceiveRawData(const char* data, size_t dataLength)
 {
     if (m_stopped)
         return;
 
     if (m_binaryType == BinaryTypeBlob) {
         // FIXME: Implement.
         return;
     }
     if (m_binaryType == BinaryTypeArrayBuffer) {
-        RefPtr<DOMArrayBuffer> buffer = DOMArrayBuffer::create(data, dataLength);
-        scheduleDispatchEvent(MessageEvent::create(buffer.release()));
+        RefPtr<DOMArrayBuffer> buffer = DOMArrayBuffer::createOrNull(data, dataLength);
+        // Being out of memory results in silent failure: message dropped.
+        if (buffer)
+            scheduleDispatchEvent(MessageEvent::create(buffer.release()));
         return;
     }
     ASSERT_NOT_REACHED();
 }
 
 void RTCDataChannel::didDetectError()
 {
     if (m_stopped)
         return;
 
@@ skipping 51 matching lines @@
 
 DEFINE_TRACE(RTCDataChannel)
 {
     visitor->trace(m_executionContext);
     visitor->trace(m_scheduledEvents);
     visitor->template registerWeakMembers<RTCDataChannel, &RTCDataChannel::clearWeakMembers>(this);
     RefCountedGarbageCollectedEventTargetWithInlineData<RTCDataChannel>::trace(visitor);
 }
 
 } // namespace blink