Missed something.
 
Issue:
https://github.com/tarantool/tarantool/issues/4637
Branch:
https://github.com/tarantool/tarantool/compare/eljashm/gh-4637-json-stack-use-after-scope
  
>Суббота, 30 ноября 2019, 0:36 +03:00 от Maria <maria.khaydich@tarantool.org>:
> 
>Json decode method allocated serializer struct on stack and referenced
>it after scope.
>
>Thanks to @Korablev77 for the initial investigation.
>
>Closes #4637
>---
> third_party/lua-cjson/lua_cjson.c | 6 +++---
> 1 file changed, 3 insertions(+), 3 deletions(-)
>
>diff --git a/third_party/lua-cjson/lua_cjson.c b/third_party/lua-cjson/lua_cjson.c
>index 3d7edbf28..3d25814f3 100644
>--- a/third_party/lua-cjson/lua_cjson.c
>+++ b/third_party/lua-cjson/lua_cjson.c
>@@ -1005,10 +1005,10 @@ static int json_decode(lua_State *l)
>                   "expected 1 or 2 arguments");
> 
>     if (lua_gettop(l) == 2) {
>- struct luaL_serializer user_cfg = *luaL_checkserializer(l);
>- luaL_serializer_parse_options(l, &user_cfg);
>+ struct luaL_serializer *user_cfg = luaL_checkserializer(l);
>+ luaL_serializer_parse_options(l, user_cfg);
>         lua_pop(l, 1);
>- json.cfg = &user_cfg;
>+ json.cfg = user_cfg;
>     } else {
>         json.cfg = luaL_checkserializer(l);
>     }
>--
>2.20.1 (Apple Git-117)
>  
 
 
--
Maria Khaydich