clean up after error

proxy/shadowsocks/protocol.go

@@ -92,6 +92,7 @@ func ReadRequest(reader io.Reader, auth *Authenticator, udp bool) (*Request, err
 		nBytes, err := reader.Read(buffer.Value[lenBuffer:])
 		if err != nil {
 			log.Error("Shadowsocks: Failed to read UDP payload: ", err)
+			return nil, transport.ErrorCorruptedPacket
 		}
 		buffer.Slice(0, lenBuffer+nBytes)
 		if request.OTA {

proxy/shadowsocks/shadowsocks.go

@@ -77,6 +77,7 @@ func (this *Shadowsocks) Listen(port v2net.Port) error {
 		udpHub, err := hub.ListenUDP(port, this.handlerUDPPayload)
 		if err != nil {
 			log.Error("Shadowsocks: Failed to listen UDP on port ", port, ": ", err)
+			return err
 		}
 		this.udpHub = udpHub
 		this.udpServer = hub.NewUDPServer(this.packetDispatcher)