From aa4f798eef4ebf1b212aacbf36f3cfb4351ea73d Mon Sep 17 00:00:00 2001
From: Remi Gacogne <remi.gacogne@powerdns.com>
Date: Mon, 15 Oct 2018 17:43:50 +0200
Subject: [PATCH] dnsdist: Check 'numberOfStoredSessions' >= 0, dismiss
 otherwise

---
 pdns/dnsdist-lua.cc | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/pdns/dnsdist-lua.cc b/pdns/dnsdist-lua.cc
index 960fdc2f1d..9f1db9f3ff 100644
--- a/pdns/dnsdist-lua.cc
+++ b/pdns/dnsdist-lua.cc
@@ -1543,7 +1543,13 @@ void setupLuaConfig(bool client)
           }
 
           if (vars->count("numberOfStoredSessions")) {
-            frontend->d_maxStoredSessions = boost::get<int>((*vars)["numberOfStoredSessions"]);
+            auto value = boost::get<int>((*vars)["numberOfStoredSessions"]);
+            if (value < 0) {
+              errlog("Invalid value '%d' for addTLSLocal() parameter 'numberOfStoredSessions', should be >= 0, dismissing", value);
+              g_outputBuffer="Invalid value '" +  std::to_string(value) + "' for addTLSLocal() parameter 'numberOfStoredSessions', should be >= 0, dimissing";
+              return;
+            }
+            frontend->d_maxStoredSessions = value;
           }
         }
 
-- 
2.47.2