linux-kernel - Re: [PATCH] scsi: fcoe: sanity check string size for store_ctrl

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Message-ID: <20170322193945.GK32449@mwanda>
Date:   Wed, 22 Mar 2017 22:39:45 +0300
From:   Dan Carpenter <dan.carpenter@...cle.com>
To:     Colin King <colin.king@...onical.com>
Cc:     Johannes Thumshirn <jth@...nel.org>,
        "James E . J . Bottomley" <jejb@...ux.vnet.ibm.com>,
        "Martin K . Petersen" <martin.petersen@...cle.com>,
        fcoe-devel@...n-fcoe.org, linux-scsi@...r.kernel.org,
        kernel-janitors@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] scsi: fcoe: sanity check string size for store_ctrl_mode
 option

On Wed, Mar 22, 2017 at 02:01:37PM +0000, Colin King wrote:
> From: Colin Ian King <colin.king@...onical.com>
> 
> Reading and writing to mode[count - 1] implies the count should not
> be less than 1 so add a sanity check for this.
> 
> Detected with CoverityScan, CID#1357345 ("Overflowed array index write")
> 
> Signed-off-by: Colin Ian King <colin.king@...onical.com>

This is harmless, of course, but count can't be zero.  This is a sysfs
file so we test for zero size writes in sysfs_kf_write() and return
early.

regards,
dan carpenter