linux-kernel - Re: [PATCH][next] media: ispstat: don't dereference user

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Message-ID: <20180426083731.72bmygsp2waf3eeu@valkosipuli.retiisi.org.uk>
Date:   Thu, 26 Apr 2018 11:37:31 +0300
From:   Sakari Ailus <sakari.ailus@....fi>
To:     Colin King <colin.king@...onical.com>
Cc:     Laurent Pinchart <laurent.pinchart@...asonboard.com>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        linux-media@...r.kernel.org, kernel-janitors@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH][next] media: ispstat: don't dereference user_cfg before
 a null check

On Tue, Apr 24, 2018 at 02:06:18PM +0100, Colin King wrote:
> From: Colin Ian King <colin.king@...onical.com>
> 
> The pointer user_cfg (a copy of new_conf) is dereference before
> new_conf is null checked, hence we may have a null pointer dereference
> on user_cfg when assigning buf_size from user_cfg->buf_size. Ensure
> this does not occur by moving the assignment of buf_size after the
> null check.
> 
> Detected by CoverityScan, CID#1468386 ("Dereference before null check")
> 
> Fixes: 68e342b3068c ("[media] omap3isp: Statistics")
> Signed-off-by: Colin Ian King <colin.king@...onical.com>

Thanks for the patch.

Gustavo sent effectively the same patch a moment earlier, and that patch
got applied instead.

-- 
Sakari Ailus
e-mail: sakari.ailus@....fi