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ceph: fix null pointer dereference in send_mds_reconnect()

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sb->s_root can be null when umounting

Signed-off-by: Yan, Zheng <zyan@redhat.com>
This commit is contained in:
Yan, Zheng 2015-04-07 15:51:08 +08:00 committed by Ilya Dryomov
parent 32ec439775
commit c0bd50e2ee
1 changed files with 2 additions and 1 deletions
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3
fs/ceph/mds_client.c
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@ -2892,7 +2892,8 @@ static void send_mds_reconnect(struct ceph_mds_client *mdsc,
spin_unlock(&session->s_cap_lock);
/* trim unused caps to reduce MDS's cache rejoin time */
shrink_dcache_parent(mdsc->fsc->sb->s_root);
if (mdsc->fsc->sb->s_root)
shrink_dcache_parent(mdsc->fsc->sb->s_root);
ceph_con_close(&session->s_con);
ceph_con_open(&session->s_con,