From 6622cf5d24758c748416d3d75ba9b252649d42b4 Mon Sep 17 00:00:00 2001
From: James Teh <jteh@mozilla.com>
Date: Mon, 16 Oct 2017 11:22:47 +1000
Subject: [PATCH] Bug 1408638: Ensure accessible isn't defunct in Windows
 RootAccessibleWrap::accNavigate. r=MarcoZ

Bug 1407475 added support for accNavigate(NAVRELATION_EMBEDS) for e10s.
However, it's possible for a client to call this on the root accessible for a window which was since closed.
Therefore, we must check whether the root accessible is defunct before trying to retrieve the tab document.

MozReview-Commit-ID: 9iR6Kvzu5Mb

--HG--
extra : rebase_source : 82afdecf915cd09cc3eaed948587b87d8ac4173b
---
 accessible/windows/msaa/RootAccessibleWrap.cpp | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/accessible/windows/msaa/RootAccessibleWrap.cpp b/accessible/windows/msaa/RootAccessibleWrap.cpp
index 6e9c54089dfd..1f1027798ee8 100644
--- a/accessible/windows/msaa/RootAccessibleWrap.cpp
+++ b/accessible/windows/msaa/RootAccessibleWrap.cpp
@@ -124,6 +124,9 @@ RootAccessibleWrap::accNavigate(
   if (!pvarEndUpAt) {
     return E_INVALIDARG;
   }
+  if (IsDefunct()) {
+    return CO_E_OBJNOTCONNECTED;
+  }
 
   Accessible* target = nullptr;
   // Get the document in the active tab.