From 3a23cd0f2683a31389f7027f8a2e8f9ade0f8ffb Mon Sep 17 00:00:00 2001
From: bert hubert <bert.hubert@powerdns.com>
Date: Wed, 12 Apr 2017 11:42:14 +0200
Subject: [PATCH] check new key before replacing old one.

---
 pdns/dnsdist-lua.cc | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/pdns/dnsdist-lua.cc b/pdns/dnsdist-lua.cc
index 7372ec3a85..4ac1121114 100644
--- a/pdns/dnsdist-lua.cc
+++ b/pdns/dnsdist-lua.cc
@@ -1467,11 +1467,13 @@ vector<std::function<void(void)>> setupLua(bool client, const std::string& confi
       }
 
       setLuaSideEffect();
-      g_key.clear();
-      if(B64Decode(key, g_key) < 0) {
+      string newkey;
+      if(B64Decode(key, newkey) < 0) {
         g_outputBuffer=string("Unable to decode ")+key+" as Base64";
         errlog("%s", g_outputBuffer);
       }
+      else
+	g_key=newkey;
     });
 
   
-- 
2.47.2