From 555d7f2058041d16f01ee8715a9c358b3d8f1923 Mon Sep 17 00:00:00 2001
From: nadoo <287492+nadoo@users.noreply.github.com>
Date: Mon, 19 Mar 2018 00:38:24 +0800
Subject: [PATCH] socks5: fixed a bug which may leads to panic when received a
 invalid socks5 udp request #20

---
 socks5.go | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/socks5.go b/socks5.go
index 45cd83b..8d06d7e 100644
--- a/socks5.go
+++ b/socks5.go
@@ -181,6 +181,11 @@ func (s *SOCKS5) ListenAndServeUDP() {
 		var pc *Socks5PktConn
 		v, ok := nm.Load(raddr.String())
 		if !ok && v == nil {
+			if c.tgtAddr == nil {
+				logf("proxy-socks5-udp can not get target address, not a valid request")
+				continue
+			}
+
 			lpc, nextHop, err := s.sDialer.DialUDP("udp", c.tgtAddr.String())
 			if err != nil {
 				logf("proxy-socks5-udp remote dial error: %v", err)