linux-kernel - Re: [PATCH v2 1/1] rtc: Replace simple

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Date:	Thu, 17 Dec 2015 14:29:56 +0100
From:	Alexandre Belloni <alexandre.belloni@...e-electrons.com>
To:	LABBE Corentin <clabbe.montjoie@...il.com>
Cc:	a.zummo@...ertech.it, linux-kernel@...r.kernel.org,
	rtc-linux@...glegroups.com
Subject: Re: [PATCH v2 1/1] rtc: Replace simple_strtoul by kstrtoul

On 17/12/2015 at 14:11:04 +0100, LABBE Corentin wrote :
> The simple_strtoul function is obsolete.
> This patch replace it by kstrtoul.
> 
> Since kstrtoul is more strict, it permits to filter some invalid input that
> simple_strtoul accept. For example:
> echo '1022xxx' > /sys/devices/pnp0/00:03/rtc/rtc0/max_user_freq
> cat /sys/devices/pnp0/00:03/rtc/rtc0/max_user_freq
> 1022
> 

Yeah, that is exactly the issue. Existing script that are doing that and
are currently working will then fail which is usually not what we want.
However, I think I'll still apply that patch.

> Signed-off-by: LABBE Corentin <clabbe.montjoie@...il.com>
> ---
>  drivers/rtc/rtc-sysfs.c | 11 +++++++++--
>  1 file changed, 9 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/rtc/rtc-sysfs.c b/drivers/rtc/rtc-sysfs.c
> index 7273855..463e286 100644
> --- a/drivers/rtc/rtc-sysfs.c
> +++ b/drivers/rtc/rtc-sysfs.c
> @@ -91,7 +91,12 @@ max_user_freq_store(struct device *dev, struct device_attribute *attr,
>  		const char *buf, size_t n)
>  {
>  	struct rtc_device *rtc = to_rtc_device(dev);
> -	unsigned long val = simple_strtoul(buf, NULL, 0);
> +	unsigned long val;
> +	int err;
> +
> +	err = kstrtoul(buf, 0, &val);
> +	if (err)
> +		return err;
>  
>  	if (val >= 4096 || val == 0)
>  		return -EINVAL;
> @@ -175,7 +180,9 @@ wakealarm_store(struct device *dev, struct device_attribute *attr,
>  		} else
>  			adjust = 1;
>  	}
> -	alarm = simple_strtoul(buf_ptr, NULL, 0);
> +	retval = kstrtoul(buf_ptr, 0, &alarm);
> +	if (retval)
> +		return retval;
>  	if (adjust) {
>  		alarm += now;
>  	}
> -- 
> 2.4.10
> 

-- 
Alexandre Belloni, Free Electrons
Embedded Linux, Kernel and Android engineering
http://free-electrons.com
--
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