lib/resolve: top-down search if NS is at current zone cut (not backtrace)

lib/resolve.c

@@ -53,17 +53,17 @@ static int ns_fetch_cut(struct kr_query *qry, struct kr_request *req)
 {
 	struct kr_cache_txn txn;
 	int ret = 0;
+
+	/* If at/subdomain of parent zone cut, start top-down search */
+	struct kr_query *parent = qry->parent;
+	if (parent && knot_dname_in(parent->zone_cut.name, qry->sname)) {
+		return kr_zonecut_set_sbelt(req->ctx, &qry->zone_cut);
+	}
+	/* Find closest zone cut from cache */
 	if (kr_cache_txn_begin(&req->ctx->cache, &txn, NAMEDB_RDONLY) != 0) {
 		ret = kr_zonecut_set_sbelt(req->ctx, &qry->zone_cut);
 	} else {
-		/* If at/subdomain of parent zone cut, start from 'one up' to avoid loops */
-		struct kr_query *parent = qry->parent;
-		const knot_dname_t *start_from = qry->sname;
-		if (parent && knot_dname_in(parent->zone_cut.name, qry->sname)) {
-			start_from = parent->zone_cut.name;
-		}
-		/* Find closest zone cut from cache */
-		ret = kr_zonecut_find_cached(req->ctx, &qry->zone_cut, start_from, &txn, qry->timestamp.tv_sec);
+		ret = kr_zonecut_find_cached(req->ctx, &qry->zone_cut, qry->sname, &txn, qry->timestamp.tv_sec);
 		kr_cache_txn_abort(&txn);
 	}
 	return ret;