From c6548bc1662a3eabc30f5407eec8d6cdb97db638 Mon Sep 17 00:00:00 2001
From: Viktor Dukhovni <postfix-users@dukhovni.org>
Date: Thu, 3 Oct 2013 20:41:49 -0400
Subject: [PATCH] Don't deref NULL pointer with klist -t

---
 kuser/klist.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/kuser/klist.c b/kuser/klist.c
index 46d918849..4640a016b 100644
--- a/kuser/klist.c
+++ b/kuser/klist.c
@@ -360,7 +360,8 @@ check_expiration(krb5_context context,
     if (ret || t == 0)
 	return 1;
 
-    *expiration = time(NULL) + t;
+    if (expiration)
+	*expiration = time(NULL) + t;
 
     return 0;
 }