From: Marek Vavruša <mvavrusa@cloudflare.com>
Date: Thu, 22 Mar 2018 18:06:43 +0000 (-0700)
Subject: kres: added missing nil check for dname2str
X-Git-Tag: v2.4.0~54^2~1
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=3e9cd2b3767130d2e93b85842f69b760866b9231;p=thirdparty%2Fknot-resolver.git

kres: added missing nil check for dname2str
---

diff --git a/daemon/lua/kres.lua b/daemon/lua/kres.lua
index 61cac2267..9d690cfef 100644
--- a/daemon/lua/kres.lua
+++ b/daemon/lua/kres.lua
@@ -251,7 +251,11 @@ ffi.metatype( sockaddr_t, {
 
 -- Pretty print for domain name
 local function dname2str(dname)
-	return ffi.string(ffi.gc(C.knot_dname_to_str(nil, dname, 0), C.free))
+	if dname == nil then return end
+	local text_name = ffi.gc(C.knot_dname_to_str(nil, dname, 0), C.free)
+	if text_name ~= nil then
+		return ffi.string(text_name)
+	end
 end
 
 -- Convert dname pointer to wireformat string