From b466c93c989529e7c7c99b9d3b4d9022764d0f69 Mon Sep 17 00:00:00 2001
From: Jeff Mitchell <jeffrey.mitchell@gmail.com>
Date: Tue, 9 Jul 2019 03:46:08 -0400
Subject: [PATCH] Add a missing lock to cluster handler

---
 vault/cluster/cluster.go | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/vault/cluster/cluster.go b/vault/cluster/cluster.go
index b618383cfa..2e6de3dfbb 100644
--- a/vault/cluster/cluster.go
+++ b/vault/cluster/cluster.go
@@ -134,7 +134,9 @@ func (cl *Listener) StopHandler(alpn string) {
 
 // Handler returns the handler for the provided ALPN name
 func (cl *Listener) Handler(alpn string) (Handler, bool) {
+	cl.l.RLock()
 	handler, ok := cl.handlers[alpn]
+	cl.l.RUnlock()
 	return handler, ok
 }