From d027a9ba75baa88207f9c4f2c337f59ded83e6e7 Mon Sep 17 00:00:00 2001
From: Neil Alexander <neilalexander@users.noreply.github.com>
Date: Fri, 28 Sep 2018 14:59:10 +0100
Subject: [PATCH] Don't peer when source interface not found

---
 src/yggdrasil/tcp.go | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/src/yggdrasil/tcp.go b/src/yggdrasil/tcp.go
index 8debba75..82673b9c 100644
--- a/src/yggdrasil/tcp.go
+++ b/src/yggdrasil/tcp.go
@@ -161,7 +161,9 @@ func (iface *tcpInterface) call(saddr string, socksaddr *string, sintf string) {
 			dialer := net.Dialer{}
 			if sintf != "" {
 				ief, err := net.InterfaceByName(sintf)
-				if err == nil {
+				if err != nil {
+					return
+				} else {
 					if ief.Flags & net.FlagUp == 0 {
 				    return
 					}