Block "]]>" in createCDataSection

Source/core/dom/Document.cpp

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  *           (C) 2001 Dirk Mueller (mueller@kde.org)
  *           (C) 2006 Alexey Proskuryakov (ap@webkit.org)
  * Copyright (C) 2004, 2005, 2006, 2007, 2008, 2009, 2011, 2012 Apple Inc. All rights reserved.
  * Copyright (C) 2008, 2009 Torch Mobile Inc. All rights reserved. (http://www.torchmobile.com/)
  * Copyright (C) 2008, 2009, 2011, 2012 Google Inc. All rights reserved.
  * Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies)
  * Copyright (C) Research In Motion Limited 2010-2011. All rights reserved.
@@ skipping 787 matching lines @@
 {
     return Comment::create(this, data);
 }
 
 PassRefPtr<CDATASection> Document::createCDATASection(const String& data, ExceptionState& es)
 {
     if (isHTMLDocument()) {
         es.throwDOMException(NotSupportedError);
         return 0;
     }
+    if (data.find("]]>") != WTF::notFound) {
+        es.throwDOMException(InvalidCharacterError, "String cannot contain ']]>' since that is the end delimiter of a CData section.");
+        return 0;
+    }
     return CDATASection::create(this, data);
 }
 
 PassRefPtr<ProcessingInstruction> Document::createProcessingInstruction(const String& target, const String& data, ExceptionState& es)
 {
     if (!isValidName(target)) {
         es.throwDOMException(InvalidCharacterError);
         return 0;
     }
     if (isHTMLDocument()) {
@@ skipping 4373 matching lines @@
 {
     return DocumentLifecycleNotifier::create(this);
 }
 
 DocumentLifecycleNotifier* Document::lifecycleNotifier()
 {
     return static_cast<DocumentLifecycleNotifier*>(ScriptExecutionContext::lifecycleNotifier());
 }
 
 } // namespace WebCore