linux-kernel - Re: [PATCH] i2c: tegra: fix a possible NULL dereference

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Message-ID: <564496E8.60106@nvidia.com>
Date:	Thu, 12 Nov 2015 13:40:56 +0000
From:	Jon Hunter <jonathanh@...dia.com>
To:	Thierry Reding <thierry.reding@...il.com>,
	LABBE Corentin <clabbe.montjoie@...il.com>
CC:	<gnurou@...il.com>, <ldewangan@...dia.com>,
	<swarren@...dotorg.org>, <wsa@...-dreams.de>,
	<linux-i2c@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
	<linux-tegra@...r.kernel.org>
Subject: Re: [PATCH] i2c: tegra: fix a possible NULL dereference


On 12/11/15 12:29, Thierry Reding wrote:
> * PGP Signed by an unknown key
> 
> On Thu, Nov 12, 2015 at 08:26:03AM +0100, LABBE Corentin wrote:
>> of_match_device could return NULL, and so cause a NULL pointer
> 
> No. There is no way that of_match_device() can ever fail. The driver
> core uses the same table to match the OF device to the driver, so the
> only case where of_match_device() would return NULL is if no match was
> found, in which case the tegra_i2c_probe() function would never have
> been called in the first place.

Right and so ...

>> dereference later at line 809:
>> i2c_dev->hw = match->data;
>>
>> Signed-off-by: LABBE Corentin <clabbe.montjoie@...il.com>
>> ---
>>  drivers/i2c/busses/i2c-tegra.c | 3 +++
>>  1 file changed, 3 insertions(+)
>>
>> diff --git a/drivers/i2c/busses/i2c-tegra.c b/drivers/i2c/busses/i2c-tegra.c
>> index a0522fc..c803551 100644
>> --- a/drivers/i2c/busses/i2c-tegra.c
>> +++ b/drivers/i2c/busses/i2c-tegra.c
>> @@ -806,7 +806,10 @@ static int tegra_i2c_probe(struct platform_device *pdev)
>>  
>>  	if (pdev->dev.of_node) {

Can we get rid of this if-statement?

Jon
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