From 77a88943d6a0d7852c25a03541d60ccf44aa5c6d Mon Sep 17 00:00:00 2001
From: Thierry Fournier <thierry.fournier@ozon.io>
Date: Sun, 29 Nov 2020 01:06:24 +0100
Subject: [PATCH] BUG/MINOR: lua: lua-load doesn't check its parameters

"lua-load" doesn't check if the expected parameter is present. It tries to
open() directly the argument at second position. So if the filename is
omitted, it tries to load an empty filename.

This patch could be backported until 1.8
---
 src/hlua.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/src/hlua.c b/src/hlua.c
index 1ecf0c165..49db0f36e 100644
--- a/src/hlua.c
+++ b/src/hlua.c
@@ -7986,6 +7986,11 @@ static int hlua_load(char **args, int section_type, struct proxy *curpx,
 {
 	int error;
 
+	if (*(args[1]) == 0) {
+		memprintf(err, "'%s' expects a file name as parameter.\n", args[0]);
+		return -1;
+	}
+
 	/* Just load and compile the file. */
 	error = luaL_loadfile(gL.T, args[1]);
 	if (error) {