From f2ab7ac5d7b819ad5b296815e30f4db57a43984b Mon Sep 17 00:00:00 2001
From: Yossi Gottlieb <yossigo@gmail.com>
Date: Mon, 31 Aug 2020 20:42:46 +0300
Subject: [PATCH] Backport Lua 5.2.2 stack overflow fix. (#7733)

This fixes the issue described in CVE-2014-5461. At this time we cannot
confirm that the original issue has a real impact on Redis, but it is
included as an extra safety measure.

(cherry picked from commit 374270d3a04e8b224a12655518c815497aeb497d)
---
 deps/lua/src/ldo.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/deps/lua/src/ldo.c b/deps/lua/src/ldo.c
index 514f7a2a3..939940a4c 100644
--- a/deps/lua/src/ldo.c
+++ b/deps/lua/src/ldo.c
@@ -274,7 +274,7 @@ int luaD_precall (lua_State *L, StkId func, int nresults) {
     CallInfo *ci;
     StkId st, base;
     Proto *p = cl->p;
-    luaD_checkstack(L, p->maxstacksize);
+    luaD_checkstack(L, p->maxstacksize + p->numparams);
     func = restorestack(L, funcr);
     if (!p->is_vararg) {  /* no varargs? */
       base = func + 1;