Commit c338c07c authored by Nathaniel Yazdani's avatar Nathaniel Yazdani Committed by Sage Weil

ceph: fix null pointer dereference

When register_session() is given an out-of-range argument for mds,
ceph_mdsmap_get_addr() will return a null pointer, which would be given to
ceph_con_open() & be dereferenced, causing a kernel oops. This fixes bug #4685
in the Ceph bug tracker <>.
Signed-off-by: default avatarNathaniel Yazdani <>
Reviewed-by: default avatarSage Weil <>
parent 73d9f7ee
......@@ -414,6 +414,9 @@ static struct ceph_mds_session *register_session(struct ceph_mds_client *mdsc,
struct ceph_mds_session *s;
if (mds >= mdsc->mdsmap->m_max_mds)
return ERR_PTR(-EINVAL);
s = kzalloc(sizeof(*s), GFP_NOFS);
if (!s)
return ERR_PTR(-ENOMEM);
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