linux-kernel - Re: [PATCH] ceph: improve error handling in ceph_mdsmap

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Date:	Tue, 28 May 2013 08:54:48 -0700 (PDT)
From:	Sage Weil <sage@...tank.com>
To:	Emil Goode <emilgoode@...il.com>
cc:	ceph-devel@...r.kernel.org, linux-kernel@...r.kernel.org,
	kernel-janitors@...r.kernel.org
Subject: Re: [PATCH] ceph: improve error handling in ceph_mdsmap_decode

Applied to ceph tree; thanks!

On Tue, 28 May 2013, Emil Goode wrote:

> This patch makes the following improvements to the error handling
> in the ceph_mdsmap_decode function:
> 
> - Add a NULL check for return value from kcalloc
> - Make use of the variable err
> 
> Signed-off-by: Emil Goode <emilgoode@...il.com>
> ---
>  fs/ceph/mdsmap.c |    4 +++-
>  1 file changed, 3 insertions(+), 1 deletion(-)
> 
> diff --git a/fs/ceph/mdsmap.c b/fs/ceph/mdsmap.c
> index 9278dec..d4d3897 100644
> --- a/fs/ceph/mdsmap.c
> +++ b/fs/ceph/mdsmap.c
> @@ -138,6 +138,8 @@ struct ceph_mdsmap *ceph_mdsmap_decode(void **p, void *end)
>  				m->m_info[mds].export_targets =
>  					kcalloc(num_export_targets, sizeof(u32),
>  						GFP_NOFS);
> +				if (m->m_info[mds].export_targets == NULL)
> +					goto badmem;
>  				for (j = 0; j < num_export_targets; j++)
>  					m->m_info[mds].export_targets[j] =
>  					       ceph_decode_32(&pexport_targets);
> @@ -170,7 +172,7 @@ bad:
>  		       DUMP_PREFIX_OFFSET, 16, 1,
>  		       start, end - start, true);
>  	ceph_mdsmap_destroy(m);
> -	return ERR_PTR(-EINVAL);
> +	return ERR_PTR(err);
>  }
>  
>  void ceph_mdsmap_destroy(struct ceph_mdsmap *m)
> -- 
> 1.7.10.4
> 
> --
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> 
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