wgengine/netstack: don't require ipnlocal.LocalBackend to start netstack

coadler · coadler · commit 2d8652e2964c · 2023-02-06T17:20:23.000-06:00
diff --git a/wgengine/netstack/netstack.go b/wgengine/netstack/netstack.go
@@ -226,10 +226,9 @@ func (ns *Impl) wrapProtoHandler(h func(stack.TransportEndpointID, stack.PacketB
 // Start sets up all the handlers so netstack can start working. Implements
 // wgengine.FakeImpl.
 func (ns *Impl) Start(lb *ipnlocal.LocalBackend) error {
-	if lb == nil {
-		panic("nil LocalBackend")
+	if lb != nil {
+		ns.lb = lb
 	}
-	ns.lb = lb
 	ns.e.AddNetworkMapCallback(ns.updateIPs)
 	// size = 0 means use default buffer size
 	const tcpReceiveBufferSize = 0
