From d94593e884993c4f8c3b2df6e03c84cb26cadfac Mon Sep 17 00:00:00 2001
From: David Anderson <danderson@tailscale.com>
Date: Fri, 3 Jul 2020 02:27:31 +0000
Subject: [PATCH] tstest/natlab: unregister conn4 if registration of conn6
 fails.

Signed-off-by: David Anderson <danderson@tailscale.com>
---
 tstest/natlab/natlab.go | 1 +
 1 file changed, 1 insertion(+)

diff --git a/tstest/natlab/natlab.go b/tstest/natlab/natlab.go
index 8137799b2..0e92f4e2b 100644
--- a/tstest/natlab/natlab.go
+++ b/tstest/natlab/natlab.go
@@ -456,6 +456,7 @@ func (m *Machine) ListenPacket(network, address string) (net.PacketConn, error)
 			return nil, err
 		}
 		if err := m.registerConn6(c); err != nil {
+			m.unregisterConn4(c)
 			return nil, err
 		}
 	case 4: