[PATCH] vinyl: fix memory leak in slice stream

[Vladimir Davydov]

Pushed to 1.10 as trivial

On Thu, Oct 25, 2018 at 08:37:23PM +0300, Vladimir Davydov wrote:
> If a tuple read from a run by a slice stream happens to be out of the
> slice bounds, it will never be freed. Fix it.
> 
> The leak was introduced by commit c174c985485c ("vinyl: implement new
> simple write iterator").
> ---
> https://github.com/tarantool/tarantool/commits/dv/vy-fix-memleak-in-slice-stream
> 
>  src/box/vy_run.c | 4 +++-
>  1 file changed, 3 insertions(+), 1 deletion(-)
> 
> diff --git a/src/box/vy_run.c b/src/box/vy_run.c
> index bb5baf2c..454833e7 100644
> --- a/src/box/vy_run.c
> +++ b/src/box/vy_run.c
> @@ -2567,8 +2567,10 @@ vy_slice_stream_next(struct vy_stmt_stream *virt_stream, struct tuple **ret)
>  	if (stream->slice->end != NULL &&
>  	    stream->page_no >= stream->slice->last_page_no &&
>  	    vy_tuple_compare_with_key(tuple, stream->slice->end,
> -				      stream->cmp_def) >= 0)
> +				      stream->cmp_def) >= 0) {
> +		tuple_unref(tuple);
>  		return 0;
> +	}
>  
>  	/* We definitely has the next non-null tuple. Save it in stream */
>  	if (stream->tuple != NULL)