From 8fa4f1380b9a203bfdf002c2e9e9e13ebb8384c1 Mon Sep 17 00:00:00 2001
From: Roberto Ierusalimschy <roberto@inf.puc-rio.br>
Date: Thu, 14 Mar 2019 15:53:42 -0300
Subject: Finalizers must be callable

Non-function __gc metamethods are not ignored; if present, the
metamethod will be called even if it is not a function.
---
 lgc.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

(limited to 'lgc.c')

diff --git a/lgc.c b/lgc.c
index c834319b..8cb3e9fa 100644
--- a/lgc.c
+++ b/lgc.c
@@ -832,7 +832,7 @@ static void GCTM (lua_State *L) {
   lua_assert(!g->gcemergency);
   setgcovalue(L, &v, udata2finalize(g));
   tm = luaT_gettmbyobj(L, &v, TM_GC);
-  if (ttisfunction(tm)) {  /* is the finalizer a function? */
+  if (!notm(tm)) {  /* is there a finalizer? */
     int status;
     lu_byte oldah = L->allowhook;
     int running  = g->gcrunning;
-- 
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