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>

diff --git a/fs/ceph/caps.c b/fs/ceph/caps.c
index 662ada4..5daf866 100644 (file)
--- 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);
        }