linux-kernel - Re: [PATCH] ceph: fix null pointer dereference

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Date:	Sun, 4 Aug 2013 21:14:10 -0700 (PDT)
From:	Sage Weil <sage@...tank.com>
To:	Nathaniel Yazdani <n1ght.4nd.d4y@...il.com>
cc:	ceph-devel@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] ceph: fix null pointer dereference

Looks right, applied to the testing branch.

Thanks!
sage


On Sun, 4 Aug 2013, Nathaniel Yazdani wrote:

> 	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@...il.com>
> ---
> diff --git a/fs/ceph/mds_client.c b/fs/ceph/mds_client.c
> index 187bf21..ddff072 100644
> --- a/fs/ceph/mds_client.c
> +++ b/fs/ceph/mds_client.c
> @@ -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);
> 
> 
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> 
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