From c7172c183f03e8460fd1e2f9b8b78ba677bb6fc1 Mon Sep 17 00:00:00 2001
From: Andreas Schneider <asn@cryptomilk.org>
Date: Mon, 28 Oct 2019 14:03:03 +0100
Subject: [PATCH] SSH-01-006: Add missing NULL check in ssh_gssapi_build_mic()

Fixes T193

Signed-off-by: Andreas Schneider <asn@cryptomilk.org>
Reviewed-by: Jakub Jelen <jjelen@redhat.com>
---
 src/gssapi.c | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/src/gssapi.c b/src/gssapi.c
index 7260f5ec..7f78c04d 100644
--- a/src/gssapi.c
+++ b/src/gssapi.c
@@ -444,13 +444,17 @@ static ssh_buffer ssh_gssapi_build_mic(ssh_session session)
     ssh_buffer mic_buffer = NULL;
     int rc;
 
+    crypto = ssh_packet_get_current_crypto(session, SSH_DIRECTION_BOTH);
+    if (crypto == NULL) {
+        return NULL;
+    }
+
     mic_buffer = ssh_buffer_new();
     if (mic_buffer == NULL) {
         ssh_set_error_oom(session);
         return NULL;
     }
 
-    crypto = ssh_packet_get_current_crypto(session, SSH_DIRECTION_BOTH);
     rc = ssh_buffer_pack(mic_buffer,
                          "dPbsss",
                          crypto->digest_len,