From 4b4f568a681394b73f2646a5533ae96e9f376645 Mon Sep 17 00:00:00 2001
From: Andreas Schneider <asn@cryptomilk.org>
Date: Thu, 23 Jan 2020 09:13:02 +0100
Subject: [PATCH] messages: Add missing NULL check

CID #1409678

Signed-off-by: Andreas Schneider <asn@cryptomilk.org>
Reviewed-by: Jakub Jelen <jjelen@redhat.com>
---
 src/messages.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/src/messages.c b/src/messages.c
index 93121fe7..25683b23 100644
--- a/src/messages.c
+++ b/src/messages.c
@@ -692,6 +692,9 @@ static ssh_buffer ssh_msg_userauth_build_digest(ssh_session session,
     int rc;
 
     crypto = ssh_packet_get_current_crypto(session, SSH_DIRECTION_IN);
+    if (crypto == NULL) {
+        return NULL;
+    }
 
     buffer = ssh_buffer_new();
     if (buffer == NULL) {