An overflow flaw was fixed in Lua 5.2.2:

  http://www.lua.org/bugs.html#5.2.2-1

This could cause the application to crash or, potentially, execute arbitrary

code. One way an attacker could trigger this issue is if they can control

parameters to a loadstring call (an eval in Lua,

http://en.wikipedia.org/wiki/Eval#Lua).

See also:

  https://bugzilla.redhat.com/show_bug.cgi?id=1132304

--- lua-5.1.4/src/ldo.c.orig	2014-08-31 09:15:30.815313542 -0700

+++ lua-5.1.4/src/ldo.c	2014-08-31 09:21:37.935417299 -0700

@@ -273,7 +273,7 @@

     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;