From 67b74ace90a5d766b2982d55ccfd1f96879602d4 Mon Sep 17 00:00:00 2001
From: Trevor Saunders <trev.saunders@gmail.com>
Date: Tue, 28 Jun 2011 16:26:37 -0700
Subject: [PATCH] bug 667396 - nsAccessibilityService::GetAccessibleFor() is an
 external api so we should NULL check the node argument r=surkov

---
 accessible/src/base/nsAccessibilityService.cpp | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/accessible/src/base/nsAccessibilityService.cpp b/accessible/src/base/nsAccessibilityService.cpp
index 6827529f6f6f..d5f6d86c4821 100644
--- a/accessible/src/base/nsAccessibilityService.cpp
+++ b/accessible/src/base/nsAccessibilityService.cpp
@@ -635,6 +635,9 @@ nsAccessibilityService::GetAccessibleFor(nsIDOMNode *aNode,
                                          nsIAccessible **aAccessible)
 {
   NS_ENSURE_ARG_POINTER(aAccessible);
+  *aAccessible = nsnull;
+  if (!aNode)
+    return NS_OK;
 
   nsCOMPtr<nsINode> node(do_QueryInterface(aNode));
   NS_IF_ADDREF(*aAccessible = GetAccessible(node));