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

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Message-ID: <f0945727-8d3d-466f-bd9e-d5f0ec87680f@embeddedor.com>
Date:   Sun, 16 Jul 2017 23:58:47 -0500
From:   "Gustavo A. R. Silva" <garsilva@...eddedor.com>
To:     Moritz Fischer <moritz.fischer@...us.com>
Cc:     Alan Tull <atull@...nel.org>, linux-fpga@...r.kernel.org,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] fpga: altera-hps2fpga: add NULL check on
 of_match_device() return value



On 07/10/2017 11:25 AM, Moritz Fischer wrote:
> On Thu, Jul 6, 2017 at 11:22 PM, Gustavo A. R. Silva
> <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>
> Reviewed-by: Moritz Fischer <mdf@...nel.org>

Thank you, Moritz.

>> ---
>>  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