linux-kernel - Re: [PATCH] drm/tegra: vic: add NULL check on of_match

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Message-ID: <20170710142934.Horde.C0p-TxoXKsaCnNgMwoIsfTu@gator4166.hostgator.com>
Date:   Mon, 10 Jul 2017 14:29:34 -0500
From:   "Gustavo A. R. Silva" <garsilva@...eddedor.com>
To:     Thierry Reding <thierry.reding@...il.com>
Cc:     David Airlie <airlied@...ux.ie>,
        Jonathan Hunter <jonathanh@...dia.com>,
        dri-devel@...ts.freedesktop.org, linux-tegra@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] drm/tegra: vic: add NULL check on of_match_device()
 return value

Hi Thierry,

Quoting Thierry Reding <thierry.reding@...il.com>:

> On Fri, Jul 07, 2017 at 01:16:26AM -0500, Gustavo A. R. Silva wrote:
>> Check return value from call to of_match_device()
>> in order to prevent a NULL pointer dereference.
>>
>> In case of NULL print error message and return.
>>
>> Signed-off-by: Gustavo A. R. Silva <garsilva@...eddedor.com>
>> ---
>>  drivers/gpu/drm/tegra/vic.c | 5 +++++
>>  1 file changed, 5 insertions(+)
>>
>> diff --git a/drivers/gpu/drm/tegra/vic.c b/drivers/gpu/drm/tegra/vic.c
>> index 47cb1aa..7e11825 100644
>> --- a/drivers/gpu/drm/tegra/vic.c
>> +++ b/drivers/gpu/drm/tegra/vic.c
>> @@ -283,6 +283,11 @@ static int vic_probe(struct platform_device *pdev)
>>  	int err;
>>
>>  	match = of_match_device(vic_match, dev);
>> +	if (!match) {
>> +		dev_err(&pdev->dev, "failed to match device\n");
>> +		return -ENODEV;
>> +	}
>
> Someone would have to go to great lengths to trigger this condition,
> might as well let it crash as a warning that they've done something
> wrong.
>

Thanks for clarifying.
--
Gustavo A. R. Silva