linux-kernel - Re: [PATCH 3/7] mfd: max77686: Fix possible NULL pointer dereference on i2c_new

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Message-ID: <20140211122232.GR32042@lee--X1>
Date:	Tue, 11 Feb 2014 12:22:32 +0000
From:	Lee Jones <lee.jones@...aro.org>
To:	Krzysztof Kozlowski <k.kozlowski@...sung.com>
Cc:	Sangbeom Kim <sbkim73@...sung.com>,
	Samuel Ortiz <sameo@...ux.intel.com>,
	linux-kernel@...r.kernel.org, linux-samsung-soc@...r.kernel.org,
	Kyungmin Park <kyungmin.park@...sung.com>,
	Marek Szyprowski <m.szyprowski@...sung.com>,
	Bartlomiej Zolnierkiewicz <b.zolnierkie@...sung.com>,
	stable@...r.kernel.org
Subject: Re: [PATCH 3/7] mfd: max77686: Fix possible NULL pointer dereference
 on i2c_new_dummy error

On Tue, 11 Feb 2014, Krzysztof Kozlowski wrote:

> During probe the driver allocates dummy I2C device for RTC with
> i2c_new_dummy() but it does not check the return value of this call.
> 
> In case of error (i2c_new_device(): memory allocation failure or I2C
> address cannot be used) this function returns NULL which is later used
> by i2c_unregister_device().
> 
> If i2c_new_dummy() fails for RTC device, fail also the probe for main
> MFD driver.
> 
> Signed-off-by: Krzysztof Kozlowski <k.kozlowski@...sung.com>
> Cc: stable@...r.kernel.org
> ---
>  drivers/mfd/max77686.c |    4 ++++
>  1 file changed, 4 insertions(+)
> 
> diff --git a/drivers/mfd/max77686.c b/drivers/mfd/max77686.c
> index f53d5823a3f7..e5fce765accb 100644
> --- a/drivers/mfd/max77686.c
> +++ b/drivers/mfd/max77686.c
> @@ -121,6 +121,10 @@ static int max77686_i2c_probe(struct i2c_client *i2c,
>  		dev_info(max77686->dev, "device found\n");
>  
>  	max77686->rtc = i2c_new_dummy(i2c->adapter, I2C_ADDR_RTC);
> +	if (!max77686->rtc) {
> +		dev_err(max77686->dev, "Failed to allocate I2C device for RTC\n");
> +		return -ENODEV;
> +	}
>  	i2c_set_clientdata(max77686->rtc, max77686);
>  
>  	max77686_irq_init(max77686);

Applied, thanks.

-- 
Lee Jones
Linaro STMicroelectronics Landing Team Lead
Linaro.org │ Open source software for ARM SoCs
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