#fixed code
                                public void free()
    {
        logger.fine("Free ICE agent");

        shutdown = true;

        //stop sending keep alives (STUN Binding Indications).
        if (stunKeepAliveThread != null)
            stunKeepAliveThread.interrupt();

        // cancel termination timer in case agent is freed
        // before termination timer is triggered
        synchronized (terminationFutureSyncRoot)
        {
            if (terminationFuture != null)
            {
                terminationFuture.cancel(true);
                terminationFuture = null;
            }
        }

        //stop responding to STUN Binding Requests.
        connCheckServer.stop();

        /*
         * Set the IceProcessingState#TERMINATED state on this Agent unless it
         * is in a termination state already.
         */
        IceProcessingState state = getState();

        if (!IceProcessingState.FAILED.equals(state)
             && !IceProcessingState.TERMINATED.equals(state))
        {
            terminate(IceProcessingState.TERMINATED);
        }

        // Free its IceMediaStreams, Components and Candidates.
        boolean interrupted = false;

        logger.fine("remove streams");
        for (IceMediaStream stream : getStreams())
        {
            try
            {
                removeStream(stream);
                logger.fine("remove stream " + stream.getName());
            }
            catch (Throwable t)
            {
                logger.fine(
                        "remove stream " + stream.getName() + " failed: " + t);
                if (t instanceof InterruptedException)
                    interrupted = true;
                else if (t instanceof ThreadDeath)
                    throw (ThreadDeath) t;
            }
        }
        if (interrupted)
            Thread.currentThread().interrupt();

        getStunStack().shutDown();

        logger.fine("ICE agent freed");
    }
#vulnerable code 
                                public void free()
    {
        logger.fine("Free ICE agent");

        shutdown = true;

        //stop sending keep alives (STUN Binding Indications).
        if (stunKeepAliveThread != null)
            stunKeepAliveThread.interrupt();

        //stop responding to STUN Binding Requests.
        connCheckServer.stop();

        /*
         * Set the IceProcessingState#TERMINATED state on this Agent unless it
         * is in a termination state already.
         */
        IceProcessingState state = getState();

        if (!IceProcessingState.FAILED.equals(state)
             && !IceProcessingState.TERMINATED.equals(state))
        {
            terminate(IceProcessingState.TERMINATED);
        }

        // Free its IceMediaStreams, Components and Candidates.
        boolean interrupted = false;

        logger.fine("remove streams");
        for (IceMediaStream stream : getStreams())
        {
            try
            {
                removeStream(stream);
                logger.fine("remove stream " + stream.getName());
            }
            catch (Throwable t)
            {
                logger.fine(
                        "remove stream " + stream.getName() + " failed: " + t);
                if (t instanceof InterruptedException)
                    interrupted = true;
                else if (t instanceof ThreadDeath)
                    throw (ThreadDeath) t;
            }
        }
        if (interrupted)
            Thread.currentThread().interrupt();

        getStunStack().shutDown();

        logger.fine("ICE agent freed");
    } 
                            #location 18 
                            #vulnerability type THREAD_SAFETY_VIOLATION