From c858a0709f991171256db74f4329a1cb8e823764 Mon Sep 17 00:00:00 2001
From: "Yan, Zheng" <zyan@redhat.com>
Date: Mon, 28 Aug 2017 15:02:42 +0800
Subject: [PATCH] ceph: fix NULL pointer dereference in ceph_flush_snaps()

Signed-off-by: "Yan, Zheng" <zyan@redhat.com>
Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
---
 fs/ceph/caps.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/fs/ceph/caps.c b/fs/ceph/caps.c
index 662ada467c32..5daf86621871 100644
--- a/fs/ceph/caps.c
+++ b/fs/ceph/caps.c
@@ -1469,7 +1469,7 @@ out:
 
 	if (psession) {
 		*psession = session;
-	} else {
+	} else if (session) {
 		mutex_unlock(&session->s_mutex);
 		ceph_put_mds_session(session);
 	}