From: Vladimír Čunát <vladimir.cunat@nic.cz>
Date: Wed, 15 Nov 2017 10:21:47 +0000 (+0100)
Subject: fix a bug for non-root zones
X-Git-Tag: v2.0.0~6^2~62
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=f7de1275054e1cd181674e09db3a1cbbe656ba28;p=thirdparty%2Fknot-resolver.git

fix a bug for non-root zones

Owner name reconstruction didn't work.
---

diff --git a/lib/cache.c b/lib/cache.c
index d9cb207a9..de4470729 100644
--- 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);