linux-kernel - Re: [PATCH v2 01/36] platform/x86: intel_mid

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Message-ID: <20200108163756.GU32742@smile.fi.intel.com>
Date:   Wed, 8 Jan 2020 18:37:56 +0200
From:   Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
To:     Mika Westerberg <mika.westerberg@...ux.intel.com>
Cc:     Darren Hart <dvhart@...radead.org>,
        Lee Jones <lee.jones@...aro.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        "H . Peter Anvin" <hpa@...or.com>, x86@...nel.org,
        Zha Qipeng <qipeng.zha@...el.com>,
        Rajneesh Bhardwaj <rajneesh.bhardwaj@...ux.intel.com>,
        "David E . Box" <david.e.box@...ux.intel.com>,
        Guenter Roeck <linux@...ck-us.net>,
        Heikki Krogerus <heikki.krogerus@...ux.intel.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Wim Van Sebroeck <wim@...ux-watchdog.org>,
        platform-driver-x86@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 01/36] platform/x86: intel_mid_powerbtn: Take a copy
 of ddata

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@...ux.intel.com>

> Fixes: c94a8ff14de3 ("platform/x86: intel_mid_powerbtn: make mid_pb_ddata const")
> Signed-off-by: Mika Westerberg <mika.westerberg@...ux.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