#fixed code
                                public AsteriskChannel getDialedChannel()
    {
        synchronized(dialedChannels) {
           for (AsteriskChannel channel:dialedChannels) {
                if (channel != null) return channel;
            }
        }
        return null;
    }
#vulnerable code 
                                public AsteriskChannel getDialedChannel()
    {
        return dialedChannel;
    } 
                            #location 3 
                            #vulnerability type THREAD_SAFETY_VIOLATION