linux-kernel - Re: [v1] i2c: busses: i2c-designware-pcidrv:- Handle return NULL error from pcim_iomap

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Message-ID: <b2999ca1-f4eb-f482-ed53-796b39798ab1@gmail.com>
Date:   Thu, 22 Dec 2016 22:41:12 +0530
From:   arvind Yadav <arvind.yadav.cs@...il.com>
To:     Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        jarkko.nikula@...ux.intel.com, wsa@...-dreams.de
Cc:     mika.westerberg@...ux.intel.com, linux-i2c@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [v1] i2c: busses: i2c-designware-pcidrv:- Handle return NULL
 error from pcim_iomap_table

Yes, It will not fail. Sorry for the noise.

Thanks
-Arvind

On Thursday 22 December 2016 08:05 PM, Andy Shevchenko wrote:
> On Thu, 2016-12-22 at 17:09 +0530, Arvind Yadav wrote:
>> Here, If pcim_iomap_table will fail. It will return NULL.
>> Kernel can run into a NULL-pointer dereference.
>> This error check will avoid NULL pointer dereference.
>>
>> Signed-off-by: Arvind Yadav <arvind.yadav.cs@...il.com>
>> ---
>>   drivers/i2c/busses/i2c-designware-pcidrv.c |    4 ++++
>>   1 file changed, 4 insertions(+)
>>
>> diff --git a/drivers/i2c/busses/i2c-designware-pcidrv.c
>> b/drivers/i2c/busses/i2c-designware-pcidrv.c
>> index d6423cf..6a1907d 100644
>> --- a/drivers/i2c/busses/i2c-designware-pcidrv.c
>> +++ b/drivers/i2c/busses/i2c-designware-pcidrv.c
>> @@ -235,6 +235,10 @@ static int i2c_dw_pci_probe(struct pci_dev *pdev,
>>   	dev->controller = controller;
>>   	dev->get_clk_rate_khz = i2c_dw_get_clk_rate_khz;
>>   	dev->base = pcim_iomap_table(pdev)[0];
>> +	if (!dev->base) {
>> +		dev_err(&pdev->dev, "I/O map table allocation
>> failed\n");
>> +		return -ENOMEM;
>> +	}
> NAK.
>
>