linux-kernel - Re: [patch] power: battery: pointer math issue in gab

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Date:	Sun, 30 Sep 2012 09:38:45 +0530
From:	anish kumar <anish198519851985@...il.com>
To:	Dan Carpenter <dan.carpenter@...cle.com>
Cc:	Anton Vorontsov <cbou@...l.ru>,
	David Woodhouse <dwmw2@...radead.org>,
	linux-kernel@...r.kernel.org, kernel-janitors@...r.kernel.org
Subject: Re: [patch] power: battery: pointer math issue in gab_probe()

On Sat, 2012-09-29 at 10:13 +0300, Dan Carpenter wrote:
> psy->properties is an enum (32 bit type) so adding sizeof() puts us
> four times further along than we intended.  It should be cast to a char
> pointer before doing the math.
You really read this driver to find out this one.
Good one.
> 
> Signed-off-by: Dan Carpenter <dan.carpenter@...cle.com>
> ---
> Casting to void * would also work on GCC, at least.
> 
> diff --git a/drivers/power/generic-adc-battery.c b/drivers/power/generic-adc-battery.c
> index 9bdf444..776f118 100644
> --- a/drivers/power/generic-adc-battery.c
> +++ b/drivers/power/generic-adc-battery.c
> @@ -279,7 +279,8 @@ static int __devinit gab_probe(struct platform_device *pdev)
>  	}
>  
>  	memcpy(psy->properties, gab_props, sizeof(gab_props));
> -	properties = psy->properties + sizeof(gab_props);
> +	properties = (enum power_supply_property *)
> +				((char *)psy->properties + sizeof(gab_props));
>  
>  	/*
>  	 * getting channel from iio and copying the battery properties


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