Bug: 'lua_settop' may use an invalid pointer to stack

1 files changed, 3 insertions, 2 deletions

diff --git a/lfunc.c b/lfunc.c
index f5889a21..3ed65de2 100644
--- a/lfunc.c
+++ b/lfunc.c
@@ -223,9 +223,9 @@ static void poptbclist (lua_State *L) {
 
 /*
 ** Close all upvalues and to-be-closed variables up to the given stack
-** level.
+** level. Return restored 'level'.
 */
-void luaF_close (lua_State *L, StkId level, int status, int yy) {
+StkId luaF_close (lua_State *L, StkId level, int status, int yy) {
   ptrdiff_t levelrel = savestack(L, level);
   luaF_closeupval(L, level);  /* first, close the upvalues */
   while (L->tbclist >= level) {  /* traverse tbc's down to that level */
@@ -234,6 +234,7 @@ void luaF_close (lua_State *L, StkId level, int status, int yy) {
     prepcallclosemth(L, tbc, status, yy);  /* close variable */
     level = restorestack(L, levelrel);
   }
+  return level;
 }