From b9f944491df2f6ff0f0521e6b692bfed6afcd90c Mon Sep 17 00:00:00 2001
From: Lua Team <team@lua.org>
Date: Tue, 1 May 2007 00:00:00 -0400
Subject: [PATCH] Fix: Count hook may be called without being set

Reported by Mike Pall in May 2007
---
 src/lvm.c | 8 +++-----
 1 file changed, 3 insertions(+), 5 deletions(-)

diff --git a/src/lvm.c b/src/lvm.c
index 08802f4..1d173d7 100644
--- a/src/lvm.c
+++ b/src/lvm.c
@@ -61,11 +61,9 @@ static void traceexec (lua_State *L, const Instruction *pc) {
   lu_byte mask = L->hookmask;
   const Instruction *oldpc = L->savedpc;
   L->savedpc = pc;
-  if (mask > LUA_MASKLINE) {  /* instruction-hook set? */
-    if (L->hookcount == 0) {
-      resethookcount(L);
-      luaD_callhook(L, LUA_HOOKCOUNT, -1);
-    }
+  if ((mask & LUA_MASKCOUNT) && L->hookcount == 0) {
+    resethookcount(L);
+    luaD_callhook(L, LUA_HOOKCOUNT, -1);
   }
   if (mask & LUA_MASKLINE) {
     Proto *p = ci_func(L->ci)->l.p;
-- 
2.11.4.GIT