From: Nikos Mavrogiannopoulos <nmav@redhat.com>
Date: Fri, 3 Mar 2017 15:18:44 +0000 (+0100)
Subject: ext/signature: reject an extension size of zero
X-Git-Tag: gnutls_3_6_0~866
X-Git-Url: http://git.ipfire.org/gitweb.cgi?a=commitdiff_plain;h=ef1fc57d142b56071c6191dd89f739c62e369ddb;p=thirdparty%2Fgnutls.git

ext/signature: reject an extension size of zero

Signed-off-by: Nikos Mavrogiannopoulos <nmav@redhat.com>
---

diff --git a/lib/ext/signature.c b/lib/ext/signature.c
index 96b97cef94..795f149182 100644
--- a/lib/ext/signature.c
+++ b/lib/ext/signature.c
@@ -128,7 +128,7 @@ _gnutls_sign_algorithm_parse_data(gnutls_session_t session,
 	sig_ext_st *priv;
 	extension_priv_data_t epriv;
 
-	if (data_size % 2 != 0)
+	if (data_size == 0 || data_size % 2 != 0)
 		return gnutls_assert_val(GNUTLS_E_UNEXPECTED_PACKET_LENGTH);
 
 	priv = gnutls_calloc(1, sizeof(*priv));