Bug 595383 - Crash in IAccessible2::role and IAccessible::get_accrole, r=davidb, a=davidb

accessible/src/msaa/nsAccessibleWrap.cpp

@@ -387,6 +387,9 @@ STDMETHODIMP nsAccessibleWrap::get_accRole(
 __try {
   VariantInit(pvarRole);
 
+  if (IsDefunct())
+    return E_FAIL;
+
   nsAccessible *xpAccessible = GetXPAccessibleFor(varChild);
   if (!xpAccessible)
     return E_FAIL;
@@ -1187,6 +1190,9 @@ nsAccessibleWrap::role(long *aRole)
 __try {
   *aRole = 0;
 
+  if (IsDefunct())
+    return E_FAIL;
+
   NS_ASSERTION(gWindowsRoleMap[nsIAccessibleRole::ROLE_LAST_ENTRY].ia2Role == ROLE_WINDOWS_LAST_ENTRY,
                "MSAA role map skewed");