pkt: initialize 'lower_qname' in knot_pkt_parse_question()

src/libknot/packet/pkt.c

@@ -604,6 +604,16 @@ int knot_pkt_parse_question(knot_pkt_t *pkt)
 	pkt->parsed += question_size;
 	pkt->qname_size = len;
 
+	/* Allocate lower_qname field. */
+	pkt->lower_qname = mm_alloc(&pkt->mm, pkt->qname_size);
+	if (pkt->lower_qname == NULL) {
+		return KNOT_ENOMEM;
+	}
+
+	/* Copy QNAME and canonicalize to lowercase. */
+	memcpy(pkt->lower_qname, pkt->wire + KNOT_WIRE_HEADER_SIZE, pkt->qname_size);
+	knot_dname_to_lower(pkt->lower_qname);
+
 	return KNOT_EOK;
 }