3.10-stable review patch. If anyone has any objections, please let me know.
------------------ From: Nathaniel Yazdani <[email protected]> commit c338c07c51e3106711fad5eb599e375eadb6855d upstream. 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 <[email protected]> Reviewed-by: Sage Weil <[email protected]> Signed-off-by: Greg Kroah-Hartman <[email protected]> --- fs/ceph/mds_client.c | 3 +++ 1 file changed, 3 insertions(+) --- a/fs/ceph/mds_client.c +++ b/fs/ceph/mds_client.c @@ -414,6 +414,9 @@ static struct ceph_mds_session *register { 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); -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
