[PATCH] vinyl: fix memory leak in slice stream

[Vladimir Davydov]

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)
-- 
2.11.0