1 files changed, 6 insertions, 1 deletions

diff --git a/src/lib/libtls/tls.c b/src/lib/libtls/tls.c
index b639873df4..7906788b08 100644
--- a/src/lib/libtls/tls.c
+++ b/src/lib/libtls/tls.c
@@ -1,4 +1,4 @@
-/* $OpenBSD: tls.c,v 1.62 2017/05/06 20:59:28 jsing Exp $ */
+/* $OpenBSD: tls.c,v 1.63 2017/05/07 01:59:34 jsing Exp $ */
 /*
  * Copyright (c) 2014 Joel Sing <jsing@openbsd.org>
  *
@@ -627,6 +627,11 @@ tls_handshake(struct tls *ctx)
                 goto out;
         }
 
+        if ((ctx->state & TLS_HANDSHAKE_COMPLETE) != 0) {
+                tls_set_errorx(ctx, "handshake already completed");
+                goto out;
+        }
+
         if ((ctx->flags & TLS_CLIENT) != 0)
                 rv = tls_handshake_client(ctx);
         else if ((ctx->flags & TLS_SERVER_CONN) != 0)