linux-kernel - Re: [PATCH 18/47] staging/lustre/hsm: HSM requests not delivered

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Date:	Tue, 29 Apr 2014 12:08:10 +0300
From:	Dan Carpenter <dan.carpenter@...cle.com>
To:	Oleg Drokin <green@...uxhacker.ru>
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	linux-kernel@...r.kernel.org, devel@...verdev.osuosl.org,
	Oleg Drokin <oleg.drokin@...el.com>,
	James Nunez <james.a.nunez@...el.com>
Subject: Re: [PATCH 18/47] staging/lustre/hsm: HSM requests not delivered

On Sun, Apr 27, 2014 at 01:06:42PM -0400, Oleg Drokin wrote:
> diff --git a/drivers/staging/lustre/lustre/llite/dir.c b/drivers/staging/lustre/lustre/llite/dir.c
> index 7fbc18e..c391b60 100644
> --- a/drivers/staging/lustre/lustre/llite/dir.c
> +++ b/drivers/staging/lustre/lustre/llite/dir.c
> @@ -1804,6 +1804,11 @@ out_rmdir:
>  		/* Compute the whole struct size */
>  		totalsize = hur_len(hur);

hur_len() has an integer overflow bug.

>  		OBD_FREE_PTR(hur);
> +
> +		/* Final size will be more than double totalsize */
> +		if (totalsize >= MDS_MAXREQSIZE / 3)
> +			return -E2BIG;

"totalsize" is signed and this condition doesn't take negatives into
consideration.  Make totalsize unsigned.

> +
>  		OBD_ALLOC_LARGE(hur, totalsize);

How do we know that "totalsize" is more than sizeof(*hur)?  If we fixed
the overflow bug then maybe this isn't a problem.  I haven't looked.

>  		if (hur == NULL)
>  			return -ENOMEM;

regards,
dan carpenter
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