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ceph: fix null pointer dereference

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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 <http://tracker.ceph.com/issues/4685>.

Signed-off-by: Nathaniel Yazdani <n1ght.4nd.d4y@gmail.com>
Reviewed-by: Sage Weil <sage@inktank.com>
This commit is contained in:
Nathaniel Yazdani 2013-08-04 21:04:30 -07:00 committed by Sage Weil
parent 73d9f7eef3
commit c338c07c51
1 changed files with 3 additions and 0 deletions
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3
fs/ceph/mds_client.c
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@ -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);