From: =?UTF-8?q?Beno=C3=AEt=20Burnichon?= <benoit.burnichon@airtag.com>
Date: Tue, 6 Dec 2011 14:18:20 +0100
Subject: [PATCH] debug.getfenv does not check whether it has an argument.
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Comes from http://www.lua.org/bugs.html#5.1.4-5

reported by Patrick Donnelly on 30 Jul 2009.
Example:
 --
 debug.getfenv()   -- should raise an error
 --

Signed-off-by: Benoît Burnichon <benoit.burnichon@airtag.com>
---
 src/ldblib.c |    1 +
 1 files changed, 1 insertions(+), 0 deletions(-)

diff --git a/src/ldblib.c b/src/ldblib.c
index 67de122..21116ac 100644
--- a/src/ldblib.c
+++ b/src/ldblib.c
@@ -45,6 +45,7 @@ static int db_setmetatable (lua_State *L) {
 
 
 static int db_getfenv (lua_State *L) {
+  luaL_checkany(L, 1);
   lua_getfenv(L, 1);
   return 1;
 }