Merge 80797

Source/WebCore/html/FormAssociatedElement.cpp

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  *           (C) 2001 Dirk Mueller (mueller@kde.org)
  * Copyright (C) 2004, 2005, 2006, 2007 Apple Inc. All rights reserved.
  *           (C) 2006 Alexey Proskuryakov (ap@nypop.com)
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
  * License as published by the Free Software Foundation; either
@@ skipping 114 matching lines @@
 void FormAssociatedElement::resetFormOwner(HTMLFormElement* form)
 {
     HTMLElement* element = toHTMLElement(this);
     const AtomicString& formId(element->fastGetAttribute(formAttr));
     if (m_form) {
         if (formId.isNull())
             return;
         m_form->removeFormElement(this);
     }
     m_form = 0;
-    if (!formId.isNull()) {
+    if (!formId.isNull() && element->inDocument()) {
         // The HTML5 spec says that the element should be associated with
         // the first element in the document to have an ID that equal to
         // the value of form attribute, so we put the result of
         // document()->getElementById() over the given element.
         Element* firstElement = element->document()->getElementById(formId);
         if (firstElement && firstElement->hasTagName(formTag))
             m_form = static_cast<HTMLFormElement*>(firstElement);
         else
             m_form = form;
     } else
@@ skipping 26 matching lines @@
     ASSERT(element->hasTagName(objectTag));
     return element;
 }
 
 HTMLElement* toHTMLElement(FormAssociatedElement* associatedElement)
 {
     return const_cast<HTMLElement*>(toHTMLElement(static_cast<const FormAssociatedElement*>(associatedElement)));
 }
 
 } // namespace Webcore