From d24e353e38ebce26563975dfdc0791e95dacbaf7 Mon Sep 17 00:00:00 2001
From: Aris Adamantiadis <aris@0xbadc0de.be>
Date: Sun, 18 Sep 2011 20:29:39 +0200
Subject: [PATCH] pki: null ptr check

---
 src/pki.c | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/src/pki.c b/src/pki.c
index dcb97bb2..d0e52c44 100644
--- a/src/pki.c
+++ b/src/pki.c
@@ -1233,7 +1233,11 @@ ssh_string ssh_srv_pki_do_sign_sessionid(ssh_session session,
     if (ctx == NULL) {
         return NULL;
     }
-    sha1_update(ctx, crypto->session_id, SHA_DIGEST_LEN);
+    if (crypto->session_id == NULL){
+        ssh_set_error(session,SSH_FATAL,"Missing session_id");
+        return NULL;
+    }
+    sha1_update(ctx, crypto->session_id, crypto->digest_len);
     sha1_final(hash, ctx);
 
 #ifdef DEBUG_CRYPTO