From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Nathaniel Yazdani , Sage Weil Subject: [PATCH 3.10 103/129] ceph: fix null pointer dereference Date: Mon, 6 Jan 2014 14:38:52 -0800 Message-Id: <20140106223902.549622631@linuxfoundation.org> In-Reply-To: <20140106223859.589799655@linuxfoundation.org> References: <20140106223859.589799655@linuxfoundation.org> MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Sender: linux-kernel-owner@vger.kernel.org List-ID: 3.10-stable review patch. If anyone has any objections, please let me know. ------------------ From: Nathaniel Yazdani 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 . Signed-off-by: Nathaniel Yazdani Reviewed-by: Sage Weil Signed-off-by: Greg Kroah-Hartman --- 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);