From 1c221cdf6d6d36d80a69f975593fe50563c8f647 Mon Sep 17 00:00:00 2001
From: Christine Dodrill <me@christine.website>
Date: Sun, 26 Mar 2017 22:03:06 -0700
Subject: [PATCH] tun2: avoid intN panic

---
 lib/tun2/server.go | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/lib/tun2/server.go b/lib/tun2/server.go
index 0ebfdc4..f9e4c64 100644
--- a/lib/tun2/server.go
+++ b/lib/tun2/server.go
@@ -365,7 +365,7 @@ func (s *Server) RoundTrip(req *http.Request) (*http.Response, error) {
 	val, ok := s.domains.Get(req.Host)
 	if ok {
 		conns, ok = val.([]*Connection)
-		if !ok || len(conns) == 0 {
+		if !ok {
 			ln.Error(errors.New("no backend connected"), ln.F{
 				"action": "no_backend_connected",
 				"remote": req.RemoteAddr,
@@ -385,6 +385,10 @@ func (s *Server) RoundTrip(req *http.Request) (*http.Response, error) {
 		}
 	}
 
+	if len(conns) == 0 {
+		return nil, errors.New("no backend connected")
+	}
+
 	c := conns[rand.Intn(len(conns))]
 
 	stream, err := c.session.OpenStream()