From: Daiki Ueno <ueno@gnu.org>
Date: Sun, 29 Nov 2020 16:44:24 +0000 (+0100)
Subject: gnutls_handshake_write: don't enqueue empty Handshake message
X-Git-Tag: 3.7.0~3^2~1
X-Git-Url: http://git.ipfire.org/gitweb/?a=commitdiff_plain;h=ec1c7425faf421096d679e9e951f55546d0a2d23;p=thirdparty%2Fgnutls.git

gnutls_handshake_write: don't enqueue empty Handshake message

Signed-off-by: Daiki Ueno <ueno@gnu.org>
---

diff --git a/lib/record.c b/lib/record.c
index 3a8f8e78cc..8b0d2bc60e 100644
--- a/lib/record.c
+++ b/lib/record.c
@@ -2370,6 +2370,10 @@ gnutls_handshake_write(gnutls_session_t session,
 	if (IS_DTLS(session))
 		return gnutls_assert_val(GNUTLS_E_INVALID_REQUEST);
 
+	/* Nothing to do */
+	if (data_size == 0)
+		return gnutls_assert_val(0);
+
 	/* When using this, the outgoing handshake messages should
 	 * also be handled manually */
 	if (!session->internals.h_read_func)