Merge r175974 - Protect Document in ProcessingInstruction::setXSLStyl…

…eSheet()

<http://webkit.org/b/138621>

Reviewed by Andreas Kling.

The patch is inspired by the following Blink revision by
<tasak@google.com>:
<https://src.chromium.org/viewvc/blink?view=rev&revision=182309>

* dom/ProcessingInstruction.cpp:
(WebCore::ProcessingInstruction::setXSLStyleSheet):

Canonical link: https://commits.webkit.org/154760.196@webkitgtk/2.6
git-svn-id: https://svn.webkit.org/repository/webkit/releases/WebKitGTK/webkit-2.6@176014 268f45cc-cd09-0410-ab3c-d52691b4dbfc

Source/WebCore/ChangeLog

@@ -1,3 +1,17 @@
+2014-11-11  David Kilzer  <ddkilzer@apple.com>
+
+        Protect Document in ProcessingInstruction::setXSLStyleSheet()
+        <http://webkit.org/b/138621>
+
+        Reviewed by Andreas Kling.
+
+        The patch is inspired by the following Blink revision by
+        <tasak@google.com>:
+        <https://src.chromium.org/viewvc/blink?view=rev&revision=182309>
+
+        * dom/ProcessingInstruction.cpp:
+        (WebCore::ProcessingInstruction::setXSLStyleSheet):
+
 2014-11-05  Shivakumar JM  <shiva.jm@samsung.com>
 
         splitText API does not match DOM specification.

Source/WebCore/dom/ProcessingInstruction.cpp

@@ -215,6 +215,7 @@ void ProcessingInstruction::setXSLStyleSheet(const String& href, const URL& base
 {
     ASSERT(m_isXSL);
     m_sheet = XSLStyleSheet::create(this, href, baseURL);
+    Ref<Document> protect(document());
     parseStyleSheet(sheet);
 }
 #endif