linux-kernel - Re: [PATCH] mfd: add null check before pointer dereference

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Message-ID: <20170524035039.Horde.8P6qvsRAtBDgvQ2a_2CB5w-@gator4166.hostgator.com>
Date:   Wed, 24 May 2017 03:50:39 -0500
From:   "Gustavo A. R. Silva" <garsilva@...eddedor.com>
To:     Lee Jones <lee.jones@...aro.org>
Cc:     Charles Keepax <ckeepax@...nsource.wolfsonmicro.com>,
        patches@...nsource.wolfsonmicro.com, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] mfd: add null check before pointer dereference

Hi Lee,

Quoting Lee Jones <lee.jones@...aro.org>:

> Please use the $SUBJECT line expected by the subsystem.
>
> The following command can help with this:
>
>   `git log --oneline -- <SUBSYSTEM>`
>

I get it.

>> Add null check before dereferencing pointer of_id in order to avoid
>> a potential NULL pointer dereference.
>>
>> Addresses-Coverity-ID: 1408830
>> Cc: Charles Keepax <ckeepax@...nsource.wolfsonmicro.com>
>> Signed-off-by: Gustavo A. R. Silva <garsilva@...eddedor.com>
>> ---
>>  drivers/mfd/wm831x-spi.c | 4 ++++
>>  1 file changed, 4 insertions(+)
>>
>> diff --git a/drivers/mfd/wm831x-spi.c b/drivers/mfd/wm831x-spi.c
>> index c332e28..7b227c9 100644
>> --- a/drivers/mfd/wm831x-spi.c
>> +++ b/drivers/mfd/wm831x-spi.c
>> @@ -34,6 +34,10 @@ static int wm831x_spi_probe(struct spi_device *spi)
>>
>>  	if (spi->dev.of_node) {
>>  		of_id = of_match_device(wm831x_of_match, &spi->dev);
>> +		if (!of_id) {
>> +			dev_err(&spi->dev, "Failed to find matching id\n");
>> +			return -EINVAL;
>> +		}
>
> I already mentioned why this isn't suitable.
>
> Please see my pre-review.
>

You are right. Let me fix that.

Thanks
--
Gustavo A. R. Silva