HTMLMediaElement::webMediaPlayer() should never be null if m_readyState >= HAVE_METADATA (multiple …

Source/core/html/HTMLMediaElement.cpp

 /*
  * Copyright (C) 2007, 2008, 2009, 2010, 2011, 2012, 2013 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
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 2688 matching lines @@
 
     // 4.8.8 - If a source element is inserted as a child of a media element that has no src
     // attribute and whose networkState has the value NETWORK_EMPTY, the user agent must invoke
     // the media element's resource selection algorithm.
     if (networkState() == HTMLMediaElement::NETWORK_EMPTY) {
         scheduleDelayedAction(LoadMediaResource);
         m_nextChildNodeToConsider = source;
         return;
     }
 
-    if (m_currentSourceNode && source == m_currentSourceNode->nextSibling()) {
-        WTF_LOG(Media, "HTMLMediaElement::sourceWasAdded - <source> inserted immediately after current source");
+    if (!m_currentSourceNode || source == m_currentSourceNode->nextSibling()) {
+        WTF_LOG(Media, "HTMLMediaElement::sourceWasAdded - no current source or <source> inserted immediately after current source");
         m_nextChildNodeToConsider = source;
         return;
     }
 
     if (m_nextChildNodeToConsider)
         return;
 
     // 4.8.9.5, resource selection algorithm, source elements section:
     // 21. Wait until the node after pointer is a node other than the end of the list. (This step might wait forever.)
     // 22. Asynchronously await a stable state...
@@ skipping 933 matching lines @@
     visitor->trace(m_error);
     visitor->trace(m_currentSourceNode);
     visitor->trace(m_nextChildNodeToConsider);
     visitor->trace(m_textTracks);
     visitor->trace(m_textTracksWhenResourceSelectionBegan);
     WillBeHeapSupplementable<HTMLMediaElement>::trace(visitor);
     HTMLElement::trace(visitor);
 }
 
 }