From a68c4118572529e0223cad3d4f2d214a54b1ab7a Mon Sep 17 00:00:00 2001
From: Mike Pall <mike>
Date: Thu, 13 Oct 2016 18:36:39 +0200
Subject: [PATCH] Fix GC step size calculation.

Thanks to Igor Ehrlich.
---
 src/lj_gc.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/lj_gc.c b/src/lj_gc.c
index c5ff1f04..2c447c79 100644
--- a/src/lj_gc.c
+++ b/src/lj_gc.c
@@ -307,7 +307,7 @@ static size_t propagatemark(global_State *g)
     if (gc_traverse_tab(g, t) > 0)
       black2gray(o);  /* Keep weak tables gray. */
     return sizeof(GCtab) + sizeof(TValue) * t->asize +
-			   sizeof(Node) * (t->hmask + 1);
+			   (t->hmask ? sizeof(Node) * (t->hmask + 1) : 0);
   } else if (LJ_LIKELY(gct == ~LJ_TFUNC)) {
     GCfunc *fn = gco2func(o);
     gc_traverse_func(g, fn);