Security fix for CVE-2014-5461,
http://openwall.com/lists/oss-security/2014/08/27/2

--- src/ldo.c.orig	Tue Sep  9 15:32:24 2014
+++ src/ldo.c	Tue Sep  9 15:33:46 2014
@@ -217,7 +217,7 @@ static StkId adjust_varargs (lua_State *L, Proto *p, i
     int nvar = actual - nfixargs;  /* number of extra arguments */
     lua_assert(p->is_vararg & VARARG_HASARG);
     luaC_checkGC(L);
-    luaD_checkstack(L, p->maxstacksize);
+    luaD_checkstack(L, p->maxstacksize + p->numparams);
     htab = luaH_new(L, nvar, 1);  /* create `arg' table */
     for (i=0; i<nvar; i++)  /* put extra arguments into `arg' table */
       setobj2n(L, luaH_setnum(L, htab, i+1), L->top - nvar + i);