From 04ded4c63183927feba565a43fafc987dba32005 Mon Sep 17 00:00:00 2001
From: Mathias Hall-Andersen <mathias@hall-andersen.dk>
Date: Sun, 11 Feb 2018 23:07:07 +0100
Subject: [PATCH] Added missing mutex acquisition

---
 cookie.go | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/cookie.go b/cookie.go
index 7cea75c..72455a4 100644
--- a/cookie.go
+++ b/cookie.go
@@ -62,6 +62,9 @@ func (st *CookieChecker) Init(pk NoisePublicKey) {
 }
 
 func (st *CookieChecker) CheckMAC1(msg []byte) bool {
+	st.mutex.RLock()
+	defer st.mutex.RUnlock()
+
 	size := len(msg)
 	smac2 := size - blake2s.Size128
 	smac1 := smac2 - blake2s.Size128