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

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Message-ID: <20180731140153.GE370@w540>
Date:   Tue, 31 Jul 2018 16:01:53 +0200
From:   jacopo mondi <jacopo@...ndi.org>
To:     Colin Ian King <colin.king@...onical.com>
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

Hi Colin,

On Tue, Jul 31, 2018 at 02:55:25PM +0100, Colin Ian King wrote:
> 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;

Yes, that's false positive but indeed gcc doesn't know about that.

A patch has already been sent and will hopefully be collected soon:
https://patchwork.linuxtv.org/patch/51259/

Thanks for noticing
   j

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