From: Yan, Zheng <zyan@redhat.com>
Date: Thu, 4 Aug 2016 00:43:33 +0000 (+0800)
Subject: ceph: fix null pointer dereference in ceph_flush_snaps()
X-Git-Url: http://drtracing.org/?a=commitdiff_plain;h=e4d2b16a445f85b7dc3fc67b21756eca515e0c74;p=deliverable%2Flinux.git

ceph: fix null pointer dereference in ceph_flush_snaps()

Signed-off-by: Yan, Zheng <zyan@redhat.com>
---

diff --git a/fs/ceph/caps.c b/fs/ceph/caps.c
index 99115cae1652..16e6ded0b7f2 100644
--- a/fs/ceph/caps.c
+++ b/fs/ceph/caps.c
@@ -1347,9 +1347,12 @@ void ceph_flush_snaps(struct ceph_inode_info *ci,
 {
 	struct inode *inode = &ci->vfs_inode;
 	struct ceph_mds_client *mdsc = ceph_inode_to_client(inode)->mdsc;
-	struct ceph_mds_session *session = *psession;
+	struct ceph_mds_session *session = NULL;
 	int mds;
+
 	dout("ceph_flush_snaps %p\n", inode);
+	if (psession)
+		session = *psession;
 retry:
 	spin_lock(&ci->i_ceph_lock);
 	if (!(ci->i_ceph_flags & CEPH_I_FLUSH_SNAPS)) {