From fa33b61102ee090f8420935b135661a70c1f7316 Mon Sep 17 00:00:00 2001
From: Andreas Schneider <asn@cryptomilk.org>
Date: Mon, 28 Oct 2019 14:20:39 +0100
Subject: [PATCH] SSH-01-006: Add missing NULL check in
 ssh_packet_hmac_verify()

Fixes T193

Signed-off-by: Andreas Schneider <asn@cryptomilk.org>
Reviewed-by: Jakub Jelen <jjelen@redhat.com>
(cherry picked from commit 69daa602b80da009413ca9e91703d6922130013d)
---
 src/packet_crypt.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/src/packet_crypt.c b/src/packet_crypt.c
index 18df9dcb..168fcc72 100644
--- a/src/packet_crypt.c
+++ b/src/packet_crypt.c
@@ -255,6 +255,10 @@ int ssh_packet_hmac_verify(ssh_session session,
   }
 
   crypto = ssh_packet_get_current_crypto(session, SSH_DIRECTION_IN);
+  if (crypto == NULL) {
+      return SSH_ERROR;
+  }
+
   ctx = hmac_init(crypto->decryptMAC, hmac_digest_len(type), type);
   if (ctx == NULL) {
     return -1;