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[Launchpad Bug Tracker <1362278@xxxxxxxxxxxxxxxxxx>]

** Branch linked: lp:~ubuntu-branches/ubuntu/utopic/lua5.1/utopic-
proposed

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https://bugs.launchpad.net/bugs/1362278

Title:
  Stack overflow in vararg functions with many fixed parameters called
  with few arguments

Status in “lua5.1” package in Ubuntu:
  Confirmed
Status in “lua5.2” package in Ubuntu:
  Fix Released
Status in “lua5.1” source package in Precise:
  Confirmed
Status in “lua5.2” source package in Precise:
  Confirmed
Status in “lua5.1” source package in Trusty:
  Confirmed
Status in “lua5.2” source package in Trusty:
  Fix Released
Status in “lua5.1” source package in Utopic:
  Confirmed
Status in “lua5.2” source package in Utopic:
  Fix Released

Bug description:
  See http://www.lua.org/bugs.html section 5.2.2 for details. Essentially:
  Stack overflow in vararg functions with many fixed parameters called with few arguments.
  reported by 云风 on 17 Apr 2013. existed since 5.1. fixed in 5.2.3.

  Example:

  function f(p1, p2, p3, p4, p5, p6, p7, p8, p9, p10,
             p11, p12, p13, p14, p15, p16, p17, p18, p19, p20,
             p21, p22, p23, p24, p25, p26, p27, p28, p29, p30,
             p31, p32, p33, p34, p35, p36, p37, p38, p39, p40,
             p41, p42, p43, p44, p45, p46, p48, p49, p50, ...)
    local a1, a2, a3, a4, a5, a6, a7, a8, a9, a10, a11, a12, a13, a14
  end

  f()   -- crashes on some machines

  Patch:

  ldo.c:
  @@ -324,7 +324,7 @@
       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++)

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