linux-kernel - Re: [PATCH][staging-next] drivers: staging: cedrus: find ctx before dereferencing it ctx

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Message-ID: <20181105152540.htkdtrcdsnngu7pk@flea>
Date:   Mon, 5 Nov 2018 16:25:40 +0100
From:   Maxime Ripard <maxime.ripard@...tlin.com>
To:     Colin King <colin.king@...onical.com>
Cc:     Paul Kocialkowski <paul.kocialkowski@...tlin.com>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Chen-Yu Tsai <wens@...e.org>, linux-media@...r.kernel.org,
        devel@...verdev.osuosl.org, linux-arm-kernel@...ts.infradead.org,
        kernel-janitors@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH][staging-next] drivers: staging: cedrus: find ctx before
 dereferencing it ctx

On Fri, Nov 02, 2018 at 07:01:26PM +0000, Colin King wrote:
> From: Colin Ian King <colin.king@...onical.com>
> 
> Currently if count is an invalid value the v4l2_info message will
> dereference a null ctx pointer to get the dev information. Fix
> this by finding ctx first and then checking for an invalid count,
> this way ctxt will be non-null hence avoiding the null pointer
> dereference.
> 
> Detected by CoverityScan, CID#1475337 ("Explicit null dereferenced")
> 
> Fixes: 50e761516f2b ("media: platform: Add Cedrus VPU decoder driver")
> Signed-off-by: Colin Ian King <colin.king@...onical.com>

Acked-by: Maxime Ripard <maxime.ripard@...tlin.com>

Thanks!
Maxime

-- 
Maxime Ripard, Bootlin
Embedded Linux and Kernel engineering
https://bootlin.com

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