linux-kernel - Re: [PATCH] fpga: altera-hps2fpga: add NULL check on of_match

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Message-ID: <20170710102550.Horde.A0-YaQd3DuTznXe59Uhkbr-@gator4166.hostgator.com>
Date:   Mon, 10 Jul 2017 10:25:50 -0500
From:   "Gustavo A. R. Silva" <garsilva@...eddedor.com>
To:     Alan Tull <atull@...nel.org>
Cc:     Moritz Fischer <moritz.fischer@...us.com>,
        linux-fpga@...r.kernel.org,
        linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] fpga: altera-hps2fpga: add NULL check on
 of_match_device() return value

Hi Alan,

Quoting Alan Tull <atull@...nel.org>:

> On Fri, Jul 7, 2017 at 1:22 AM, Gustavo A. R. Silva
>
> Hi Gustavo,
>
> Thanks for the fix!
>

Absolutely, glad to help. :)

> Alan
>
> <garsilva@...eddedor.com> 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 -ENODEV
>>
>> Signed-off-by: Gustavo A. R. Silva <garsilva@...eddedor.com>
>
> Acked-by: Alan Tull <atull@...nel.org>
>
>> ---
>>  drivers/fpga/altera-hps2fpga.c | 5 +++++
>>  1 file changed, 5 insertions(+)
>>
>> diff --git a/drivers/fpga/altera-hps2fpga.c b/drivers/fpga/altera-hps2fpga.c
>> index 3066b80..ca8212c 100644
>> --- a/drivers/fpga/altera-hps2fpga.c
>> +++ b/drivers/fpga/altera-hps2fpga.c
>> @@ -143,6 +143,11 @@ static int alt_fpga_bridge_probe(struct  
>> platform_device *pdev)
>>         int ret;
>>
>>         of_id = of_match_device(altera_fpga_of_match, dev);
>> +       if (!of_id) {
>> +               dev_err(dev, "failed to match device\n");
>> +               return -ENODEV;
>> +       }
>> +
>>         priv = (struct altera_hps2fpga_data *)of_id->data;
>>
>>         priv->bridge_reset = of_reset_control_get_by_index(dev->of_node, 0);
>> --
>> 2.5.0
>>
--
Gustavo A. R. Silva