From 00a4da3b8c0e277851b552aa4374881ce3ca9dca Mon Sep 17 00:00:00 2001
From: Olaoluwa Osuntokun <laolu32@gmail.com>
Date: Thu, 16 Feb 2017 20:45:01 +0800
Subject: [PATCH] htlcswitch: fix panic when receiving close req for unknown
 channel

---
 htlcswitch.go | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/htlcswitch.go b/htlcswitch.go
index 84347369..5af74485 100644
--- a/htlcswitch.go
+++ b/htlcswitch.go
@@ -658,8 +658,13 @@ func (h *htlcSwitch) handleCloseLink(req *closeLinkReq) {
 // channel's available bandwidth by the delta specified within the message.
 func (h *htlcSwitch) handleLinkUpdate(req *linkInfoUpdateMsg) {
 	h.chanIndexMtx.RLock()
-	link := h.chanIndex[*req.targetLink]
+	link, ok := h.chanIndex[*req.targetLink]
 	h.chanIndexMtx.RUnlock()
+	if !ok {
+		hswcLog.Errorf("received link update for non-existent link: %v",
+			req.targetLink)
+		return
+	}
 
 	atomic.AddInt64(&link.availableBandwidth, int64(req.bandwidthDelta))