From c4b45acae326b9d5d74f70070ee3999121fd41e3 Mon Sep 17 00:00:00 2001
From: Cloud Wu <cloudwu@gmail.com>
Date: Tue, 29 Mar 2016 12:34:55 +0800
Subject: [PATCH] sproto: check args

---
 lualib-src/sproto/lsproto.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/lualib-src/sproto/lsproto.c b/lualib-src/sproto/lsproto.c
index 22e53189..6214fdc9 100644
--- a/lualib-src/sproto/lsproto.c
+++ b/lualib-src/sproto/lsproto.c
@@ -532,6 +532,9 @@ lprotocol(lua_State *L) {
 		lua_pushstring(L, name);
 	} else {
 		const char * name = lua_tostring(L, 2);
+		if (name == NULL) {
+			return luaL_argerror(L, 2, "Should be number or string");
+		}
 		tag = sproto_prototag(sp, name);
 		if (tag < 0)
 			return 0;