ceph: fix NULL dereference in ceph_queue_cap_snap()
old_snapc->seq is used in dout(...)
Signed-off-by: Yan, Zheng <zyan@redhat.com>
diff --git a/fs/ceph/snap.c b/fs/ceph/snap.c
index 9caaa7f..eadf2c3 100644
--- a/fs/ceph/snap.c
+++ b/fs/ceph/snap.c
@@ -551,7 +551,6 @@
ci->i_wrbuffer_ref_head = 0;
capsnap->context = old_snapc;
list_add_tail(&capsnap->ci_item, &ci->i_cap_snaps);
- old_snapc = NULL;
if (used & CEPH_CAP_FILE_WR) {
dout("queue_cap_snap %p cap_snap %p snapc %p"
@@ -563,6 +562,7 @@
__ceph_finish_cap_snap(ci, capsnap);
}
capsnap = NULL;
+ old_snapc = NULL;
update_snapc:
if (ci->i_head_snapc) {