From c338c07c51e3106711fad5eb599e375eadb6855d Mon Sep 17 00:00:00 2001
From: Nathaniel Yazdani <n1ght.4nd.d4y@gmail.com>
Date: Sun, 4 Aug 2013 21:04:30 -0700
Subject: [PATCH] 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 <http://tracker.ceph.com/issues/4685>.

Signed-off-by: Nathaniel Yazdani <n1ght.4nd.d4y@gmail.com>
Reviewed-by: Sage Weil <sage@inktank.com>
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