Re: [patch] power: battery: pointer math issue in gab_probe()

anish kumar
2012-09-30T04:08:55Z

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@oracle.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