tls: avoid passing NULL to strlen() when generating a certificate

diff --git a/src/libknot/quic/tls_common.c b/src/libknot/quic/tls_common.c
index 31b37f71645c681ff9adbdfa44f1a94b51a05b58..5df73b8b3ab8e1350904c20bc58de9e325187adb 100644 (file)
--- a/src/libknot/quic/tls_common.c
+++ b/src/libknot/quic/tls_common.c
@@ -127,12 +127,12 @@ static int self_signed_cert(gnutls_certificate_credentials_t tls_cert,
        gnutls_datum_t san_der = { 0 };
 
        gnutls_datum_t hostname = {
-               .data = (unsigned char *)sockaddr_hostname(),
-               .size = strlen((char *)hostname.data)
+               .data = (unsigned char *)sockaddr_hostname()
        };
        if (hostname.data == NULL) {
                return GNUTLS_E_MEMORY_ERROR;
        }
+       hostname.size = strlen((char *)hostname.data);
 
        int ret;
        uint8_t serial[16];