1 files changed, 2 insertions, 2 deletions

diff --git a/networking/tls.c b/networking/tls.c
index db518bf90..fd3cb0dba 100644
--- a/networking/tls.c
+++ b/networking/tls.c
@@ -1199,11 +1199,11 @@ static void send_client_hello_and_alloc_hsd(tls_state_t *tls, const char *sni)
         };
         struct client_hello *record;
         int len;
-        int sni_len = sni ? strnlen(sni, 127) : 0;
+        int sni_len = sni ? strnlen(sni, 127 - 9) : 0;
 
         len = sizeof(*record);
         if (sni_len)
-                len += 11 + strlen(sni);
+                len += 11 + sni_len;
         record = tls_get_outbuf(tls, len);
         memset(record, 0, len);