Bug 663893 - Avoid null dereferences in websocket handler. r=mcmanus

--HG--
extra : transplant_source : %07%15%DD%3B%BF%B8%8B%BFK%1E3%28%7F%BE%8Ek%EFPu%7B

netwerk/protocol/websocket/nsWebSocketHandler.cpp

@@ -865,9 +865,11 @@ nsWebSocketHandler::ProcessInput(PRUint8 *buffer, PRUint32 count)
                     mCloseTimer->Cancel();
                     mCloseTimer = nsnull;
                 }
-                nsCOMPtr<nsIRunnable> event =
-                    new CallOnServerClose(mListener, mContext);
-                NS_DispatchToMainThread(event);
+                if (mListener) {
+                    nsCOMPtr<nsIRunnable> event =
+                            new CallOnServerClose(mListener, mContext);
+                    NS_DispatchToMainThread(event);
+                }
 
                 if (mClientClosed)
                     ReleaseSession();
@@ -1314,9 +1316,11 @@ nsWebSocketHandler::StopSession(nsresult reason)
 
     if (!mCalledOnStop) {
         mCalledOnStop = 1;
-        nsCOMPtr<nsIRunnable> event =
-            new CallOnStop(mListener, mContext, reason);
-        NS_DispatchToMainThread(event);
+        if (mListener) {
+            nsCOMPtr<nsIRunnable> event =
+                    new CallOnStop(mListener, mContext, reason);
+            NS_DispatchToMainThread(event);
+        }
     }
 
     return;