tls: fix incorrect address arithmetic (Coverity)

diff --git a/src/utils/common/tls.c b/src/utils/common/tls.c
index a609dee52b53c2ed1a61891bfe0ed2aa57960c6e..851b2e9086c72fdab32d1a1143f1c0dc01a48107 100644 (file)
--- a/src/utils/common/tls.c
+++ b/src/utils/common/tls.c
@@ -1,4 +1,4 @@
-/*  Copyright (C) 2018 CZ.NIC, z.s.p.o. <knot-dns@labs.nic.cz>
+/*  Copyright (C) 2019 CZ.NIC, z.s.p.o. <knot-dns@labs.nic.cz>
 
     This program is free software: you can redistribute it and/or modify
     it under the terms of the GNU General Public License as published by
@@ -460,7 +460,8 @@ int tls_ctx_receive(tls_ctx_t *ctx, uint8_t *buf, const size_t buf_len)
 
        // Receive message header.
        while (total < sizeof(msg_len)) {
-               ssize_t ret = gnutls_record_recv(ctx->session, &msg_len + total,
+               ssize_t ret = gnutls_record_recv(ctx->session,
+                                                (uint8_t *)&msg_len + total,
                                                 sizeof(msg_len) - total);
                if (ret > 0) {
                        total += ret;