[Tarantool-patches] [PATCH] Stack use after scope

[Nikita Pettik]

On 30 Nov 00:36, Maria wrote:
> Json decode method allocated serializer struct on stack and referenced
> it after scope.
> 
> Thanks to @Korablev77 for the initial investigation.

A bit extended commit message and pushed to master and backported
to 1.10 and 2.2 as obvious.
 
> 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)
>