3.10-stable review patch. If anyone has any objections, please let me know. ------------------ From: Nathaniel Yazdani <n1ght.4nd.d4y@xxxxxxxxx> 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 <n1ght.4nd.d4y@xxxxxxxxx> Reviewed-by: Sage Weil <sage@xxxxxxxxxxx> Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx> --- 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 stable" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html