linux-kernel - Re: [PATCH][media-next] media: i2c: mt9v111: fix off-by-one array bounds check

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Message-ID: <c2684aa2-71d7-b82e-df18-65ea3f026d97@canonical.com>
Date:   Tue, 31 Jul 2018 14:55:25 +0100
From:   Colin Ian King <colin.king@...onical.com>
To:     jacopo mondi <jacopo@...ndi.org>
Cc:     Mauro Carvalho Chehab <mchehab@...nel.org>,
        linux-media@...r.kernel.org, kernel-janitors@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH][media-next] media: i2c: mt9v111: fix off-by-one array
 bounds check

On 31/07/18 14:53, jacopo mondi wrote:
> Hi Colin,
>    thanks for the patch.
> 
> On Tue, Jul 31, 2018 at 02:33:43PM +0100, Colin King wrote:
>> From: Colin Ian King <colin.king@...onical.com>
>>
>> The check of fse->index is off-by-one and should be using >= rather
>> than > to check the maximum allowed array index. Fix this.
>>
>> Detected by CoverityScan, CID#172122 ("Out-of-bounds read")
>>
>> Fixes: aab7ed1c3927 ("media: i2c: Add driver for Aptina MT9V111")
>> Signed-off-by: Colin Ian King <colin.king@...onical.com>
> 
> Acked-by: Jacopo Mondi <jacopo+renesas@...ndi.org>
> 
> Thanks
>   j
> 

Just to note, I also got a build warning on this driver, so that's
something that should be fixed up too.

drivers/media/i2c/mt9v111.c:887:15: warning: 'idx' may be used
uninitialized in this function [-Wmaybe-uninitialized]
  unsigned int idx;




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