From e3703f0d3d86e9154b4bed785e455a984aaa7c22 Mon Sep 17 00:00:00 2001
From: Boris Zbarsky <bzbarsky@mit.edu>
Date: Fri, 23 Jan 2009 10:16:10 -0500
Subject: [PATCH] Bug 474938.  Restore silly speculative parsing workaround. 
 r+sr=peterv

---
 layout/base/nsCSSFrameConstructor.cpp | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/layout/base/nsCSSFrameConstructor.cpp b/layout/base/nsCSSFrameConstructor.cpp
index 4666f8fe82a..4892cb87c5f 100644
--- a/layout/base/nsCSSFrameConstructor.cpp
+++ b/layout/base/nsCSSFrameConstructor.cpp
@@ -5073,6 +5073,10 @@ nsCSSFrameConstructor::FindInputData(nsIContent* aContent,
   nsCOMPtr<nsIFormControl> control = do_QueryInterface(aContent);
   NS_ASSERTION(control, "input doesn't implement nsIFormControl?");
 
+  if (!control) { // Speculative parsing is screwing up somehow, dammit
+    return nsnull;
+  }
+
   return FindDataByInt(control->GetType(), aContent, aStyleContext,
                        sInputData, NS_ARRAY_LENGTH(sInputData));
 }