From f43b9ac9bd233232343e4f4c7873d7da9bfc1a1a Mon Sep 17 00:00:00 2001
From: "timeless%mozdev.org"
 <timeless%mozdev.org@18797224-902f-48f8-a5cc-f745e15eee43>
Date: Fri, 5 Mar 2010 08:06:38 +0000
Subject: [PATCH] Bug 548185 Crash on event.dataTransfer.setDragImage({},0,0)
 [@ nsINode::GetCurrentDoc() ] r=smaug a=beltzner

git-svn-id: svn://10.0.0.236/trunk@259883 18797224-902f-48f8-a5cc-f745e15eee43
---
 mozilla/widget/src/xpwidgets/nsBaseDragService.cpp | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/mozilla/widget/src/xpwidgets/nsBaseDragService.cpp b/mozilla/widget/src/xpwidgets/nsBaseDragService.cpp
index 01f250a42ff..cf4950c0bd7 100644
--- a/mozilla/widget/src/xpwidgets/nsBaseDragService.cpp
+++ b/mozilla/widget/src/xpwidgets/nsBaseDragService.cpp
@@ -363,6 +363,9 @@ static nsIPresShell*
 GetPresShellForContent(nsIDOMNode* aDOMNode)
 {
   nsCOMPtr<nsIContent> content = do_QueryInterface(aDOMNode);
+  if (!content)
+    return nsnull;
+
   nsCOMPtr<nsIDocument> document = content->GetCurrentDoc();
   if (document) {
     document->FlushPendingNotifications(Flush_Display);