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

--- src/ldo.c.orig 2014-08-31 09:13:13.318213607 -0700

+++ src/ldo.c 2014-08-31 09:23:49.433127527 -0700

@@ -323,7 +323,7 @@

case LUA_TLCL: { /* Lua function: prepare its call */

StkId base;

Proto *p = clLvalue(func)->p;

- luaD_checkstack(L, p->maxstacksize);

+ luaD_checkstack(L, p->maxstacksize + p->numparams);

func = restorestack(L, funcr);

n = cast_int(L->top - func) - 1; /* number of real arguments */

for (; n < p->numparams; n++)