Use after free in WebCore::dispatchEditableContentChangedEvents

Source/core/editing/Editor.cpp

 /*
  * Copyright (C) 2006, 2007, 2008, 2011 Apple Inc. All rights reserved.
  * Copyright (C) 2008 Nokia Corporation and/or its subsidiary(-ies)
  *
  * 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
@@ skipping 729 matching lines @@
 void Editor::indent()
 {
     applyCommand(IndentOutdentCommand::create(m_frame->document(), IndentOutdentCommand::Indent));
 }
 
 void Editor::outdent()
 {
     applyCommand(IndentOutdentCommand::create(m_frame->document(), IndentOutdentCommand::Outdent));
 }
 
-static void dispatchEditableContentChangedEvents(Element* startRoot, Element* endRoot)
+static void dispatchEditableContentChangedEvents(PassRefPtr<Element> startRoot, PassRefPtr<Element> endRoot)
 {
     if (startRoot)
         startRoot->dispatchEvent(Event::create(eventNames().webkitEditableContentChangedEvent, false, false), IGNORE_EXCEPTION);
     if (endRoot && endRoot != startRoot)
         endRoot->dispatchEvent(Event::create(eventNames().webkitEditableContentChangedEvent, false, false), IGNORE_EXCEPTION);
 }
 
 void Editor::appliedEditing(PassRefPtr<CompositeEditCommand> cmd)
 {
     m_frame->document()->updateLayout();
@@ skipping 1861 matching lines @@
 
     return checkingTypes;
 }
 
 bool Editor::unifiedTextCheckerEnabled() const
 {
     return WebCore::unifiedTextCheckerEnabled(m_frame);
 }
 
 } // namespace WebCore