fix a bug for non-root zones

Owner name reconstruction didn't work.

diff --git a/lib/cache.c b/lib/cache.c
index d9cb207a9317eb9a7f4863f7e2904a9e4c9b0b90..de4470729bb4334c7fbe88eaa7febd2253fc4cc2 100644 (file)
--- a/lib/cache.c
+++ b/lib/cache.c
@@ -477,7 +477,10 @@ static int dname_wire_reconstruct(knot_dname_t *buf, const struct key *k,
                assert(false);
                return ret;
        }
-       ret = knot_dname_to_wire(buf + ret, k->zname, KNOT_DNAME_MAXLEN - kwz.len);
+               /* The last written byte is the zero label for root -> overwrite. */
+       knot_dname_t *zone_start = buf + ret - 1;
+       assert(*zone_start == '\0');
+       ret = knot_dname_to_wire(zone_start, k->zname, KNOT_DNAME_MAXLEN - kwz.len);
        if (ret != k->zlf_len + 1) {
                assert(false);
                return ret < 0 ? ret : kr_error(EILSEQ);