diff --git a/CHANGELOG b/CHANGELOG
index 1a94b9c..1cc4057 100644
--- a/CHANGELOG
+++ b/CHANGELOG
@@ -1,8 +1,10 @@
 proxy更新日志
 v6.4
 1.http(s)代理增加了--jumper参数,可以穿透外部代理连接上级.
-2.sps代理增加了--jumper参数,可以穿透外部代理连接上级.
-3.修复了--debug不能正常工作的问题.
+2.优化了socks5代理UDP功能可能存在的内存占用过多问题.
+3.优化了jumper,避免某些情况下不能正确返回错误的问题.
+4.sps代理增加了--jumper参数,可以穿透外部代理连接上级.
+5.修复了--debug不能正常工作的问题.
 
 v6.3
 1.fixed #156
diff --git a/VERSION b/VERSION
index 1f2be2a..124bfa2 100644
--- a/VERSION
+++ b/VERSION
@@ -1 +1 @@
-6.3
\ No newline at end of file
+6.4
\ No newline at end of file
diff --git a/services/mux/mux_client.go b/services/mux/mux_client.go
index 9e9ab6a..1cdcaf6 100644
--- a/services/mux/mux_client.go
+++ b/services/mux/mux_client.go
@@ -242,9 +242,9 @@ func (s *MuxClient) getParentConn() (conn net.Conn, err error) {
 				conn = net.Conn(&_conn)
 			}
 		} else {
-			conf, err := utils.TlsConfig(s.cfg.CertBytes, s.cfg.KeyBytes, nil)
-			if err != nil {
-				return nil, err
+			conf, e := utils.TlsConfig(s.cfg.CertBytes, s.cfg.KeyBytes, nil)
+			if e != nil {
+				return nil, e
 			}
 			var _c net.Conn
 			_c, err = s.jumper.Dial(*s.cfg.Parent, time.Millisecond*time.Duration(*s.cfg.Timeout))
diff --git a/services/socks/udp.go b/services/socks/udp.go
index 5d9ebd1..582024b 100644
--- a/services/socks/udp.go
+++ b/services/socks/udp.go
@@ -174,9 +174,9 @@ func (s *Socks) proxyUDP(inConn *net.Conn, serverConn *socks.ServerConn) {
 	}
 	s.log.Printf("use proxy %v : udp %s", useProxy, serverConn.Target())
 	//relay
+	buf := utils.LeakyBuffer.Get()
+	defer utils.LeakyBuffer.Put(buf)
 	for {
-		buf := utils.LeakyBuffer.Get()
-		defer utils.LeakyBuffer.Put(buf)
 		n, srcAddr, err := udpListener.ReadFromUDP(buf)
 		if err != nil {
 			s.log.Printf("udp listener read fail, %s", err.Error())
diff --git a/services/sps/socksudp.go b/services/sps/socksudp.go
index cc52f38..5a58eb4 100644
--- a/services/sps/socksudp.go
+++ b/services/sps/socksudp.go
@@ -126,9 +126,9 @@ func (s *SPS) proxyUDP(inConn *net.Conn, serverConn *socks.ServerConn) {
 	//s.log.Printf("parent udp address %s", client.UDPAddr)
 	destAddr, _ = net.ResolveUDPAddr("udp", client.UDPAddr)
 	//relay
+	buf := utils.LeakyBuffer.Get()
+	defer utils.LeakyBuffer.Put(buf)
 	for {
-		buf := utils.LeakyBuffer.Get()
-		defer utils.LeakyBuffer.Put(buf)
 		n, srcAddr, err := udpListener.ReadFromUDP(buf)
 		if err != nil {
 			s.log.Printf("udp listener read fail, %s", err.Error())
diff --git a/services/sps/ssudp.go b/services/sps/ssudp.go
index 9eccf1e..a3dd71a 100644
--- a/services/sps/ssudp.go
+++ b/services/sps/ssudp.go
@@ -27,9 +27,9 @@ func (s *SPS) RunSSUDP(addr string) (err error) {
 				s.log.Printf("udp local->out io copy crashed:\n%s\n%s", e, string(debug.Stack()))
 			}
 		}()
+		buf := utils.LeakyBuffer.Get()
+		defer utils.LeakyBuffer.Put(buf)
 		for {
-			buf := utils.LeakyBuffer.Get()
-			defer utils.LeakyBuffer.Put(buf)
 			n, srcAddr, err := listener.ReadFrom(buf)
 			if err != nil {
 				s.log.Printf("read from client error %s", err)
diff --git a/utils/jumper/jumper.go b/utils/jumper/jumper.go
index 11fe4eb..4e26029 100644
--- a/utils/jumper/jumper.go
+++ b/utils/jumper/jumper.go
@@ -24,8 +24,9 @@ func (s socks5Dialer) Dial(network, addr string) (net.Conn, error) {
 }
 
 func New(proxyURL string, timeout time.Duration) (j Jumper, err error) {
-	u, err := url.Parse(proxyURL)
-	if err != nil {
+	u, e := url.Parse(proxyURL)
+	if e != nil {
+		err = e
 		return
 	}
 	j = Jumper{
@@ -34,7 +35,7 @@ func New(proxyURL string, timeout time.Duration) (j Jumper, err error) {
 	}
 	return
 }
-func (j *Jumper) Dial(address string, timeout time.Duration) (conn net.Conn, err error) {
+func (j *Jumper) Dial(address string, timeout time.Duration) (net.Conn, error) {
 	switch j.proxyURL.Scheme {
 	case "https":
 		return j.dialHTTPS(address, timeout)
@@ -70,10 +71,10 @@ func (j *Jumper) dialHTTPS(address string, timeout time.Duration) (conn net.Conn
 	}
 	reply := make([]byte, 1024)
 	conn.SetDeadline(time.Now().Add(timeout))
-	n, err := conn.Read(reply)
+	n, e := conn.Read(reply)
 	conn.SetDeadline(time.Time{})
-	if err != nil {
-		err = fmt.Errorf("error read reply from proxy: %s", err)
+	if e != nil {
+		err = fmt.Errorf("error read reply from proxy: %s", e)
 		conn.Close()
 		conn = nil
 		return
@@ -94,9 +95,9 @@ func (j *Jumper) dialSOCKS5(address string, timeout time.Duration) (conn net.Con
 	} else {
 		auth = nil
 	}
-	dialSocksProxy, err := proxy.SOCKS5("tcp", j.proxyURL.Host, auth, socks5Dialer{timeout: timeout})
-	if err != nil {
-		err = fmt.Errorf("error connecting to proxy: %s", err)
+	dialSocksProxy, e := proxy.SOCKS5("tcp", j.proxyURL.Host, auth, socks5Dialer{timeout: timeout})
+	if e != nil {
+		err = fmt.Errorf("error connecting to proxy: %s", e)
 		return
 	}
 	return dialSocksProxy.Dial("tcp", address)