From mboxrd@z Thu Jan  1 00:00:00 1970
From: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Subject: Re: [PATCH v2 01/36] platform/x86: intel_mid_powerbtn: Take a copy
 of ddata
Date: Wed, 8 Jan 2020 18:37:56 +0200
Message-ID: <20200108163756.GU32742@smile.fi.intel.com>
References: <20200108114201.27908-1-mika.westerberg@linux.intel.com>
 <20200108114201.27908-2-mika.westerberg@linux.intel.com>
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To: Mika Westerberg <mika.westerberg@linux.intel.com>
Cc: Darren Hart <dvhart@infradead.org>, Lee Jones <lee.jones@linaro.org>, Thomas Gleixner <tglx@linutronix.de>, Ingo Molnar <mingo@redhat.com>, Borislav Petkov <bp@alien8.de>, "H . Peter Anvin" <hpa@zytor.com>, x86@kernel.org, Zha Qipeng <qipeng.zha@intel.com>, Rajneesh Bhardwaj <rajneesh.bhardwaj@linux.intel.com>, "David E . Box" <david.e.box@linux.intel.com>, Guenter Roeck <linux@roeck-us.net>, Heikki Krogerus <heikki.krogerus@linux.intel.com>, Greg Kroah-Hartman <gregkh@linuxfoundation.org>, Wim Van Sebroeck <wim@linux-watchdog.org>, platform-driver-x86@vger.kernel.org, linux-kernel@vger.kernel.org
List-Id: platform-driver-x86.vger.kernel.org

On Wed, Jan 08, 2020 at 02:41:26PM +0300, Mika Westerberg wrote:
> The driver gets driver_data from memory that is marked as const (which
> is probably put to read-only memory) and it then modifies it. This
> likely causes some sort of fault to happen.
> 
> Fix this by taking a copy of the structure.
> 

Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>

> Fixes: c94a8ff14de3 ("platform/x86: intel_mid_powerbtn: make mid_pb_ddata const")
> Signed-off-by: Mika Westerberg <mika.westerberg@linux.intel.com>
> ---
>  drivers/platform/x86/intel_mid_powerbtn.c | 5 +++--
>  1 file changed, 3 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/platform/x86/intel_mid_powerbtn.c b/drivers/platform/x86/intel_mid_powerbtn.c
> index 292bace83f1e..6f436836fe50 100644
> --- a/drivers/platform/x86/intel_mid_powerbtn.c
> +++ b/drivers/platform/x86/intel_mid_powerbtn.c
> @@ -146,9 +146,10 @@ static int mid_pb_probe(struct platform_device *pdev)
>  
>  	input_set_capability(input, EV_KEY, KEY_POWER);
>  
> -	ddata = (struct mid_pb_ddata *)id->driver_data;
> +	ddata = devm_kmemdup(&pdev->dev, (void *)id->driver_data,
> +			     sizeof(*ddata), GFP_KERNEL);
>  	if (!ddata)
> -		return -ENODATA;
> +		return -ENOMEM;
>  
>  	ddata->dev = &pdev->dev;
>  	ddata->irq = irq;
> -- 
> 2.24.1
> 

-- 
With Best Regards,
Andy Shevchenko