linux-kernel - Re: [patch] w1: small type cleanup in sysfs

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Date:	Tue, 11 Feb 2014 10:45:13 -0600
From:	David Fries <David@...es.net>
To:	Dan Carpenter <dan.carpenter@...cle.com>
Cc:	Evgeniy Polyakov <zbr@...emap.net>, linux-kernel@...r.kernel.org,
	kernel-janitors@...r.kernel.org
Subject: Re: [patch] w1: small type cleanup in sysfs

Dan,

I have some other changes in work, how automated is your checkers?
How much work is it for me to give a github repository and branch and
find out if I introduced any problems before submitting them?


I didn't get how you could get a less than one after a check for less
than one from the description or patch until I looked at the rest of
the source code.  Looks good if the description mentions
max_slave_count is an int.

How about wording it,

On 64 bit systems, a large value for "long tmp" is truncated when
assigning to "int md->max_slave_count" so we still end up with a value
less than one despite the "tmp < 1" check.

Acked-by: David Fries <david@...es.net>

On Tue, Feb 11, 2014 at 07:08:26PM +0300, Dan Carpenter wrote:
> On 64 bit systems, a large value for "tmp" could be truncated so we
> still end up with a ->max_slave_count which is less than one despite the
> "tmp < 1" check.
> 
> This is more of a problem for static checkers than a real life issue,
> but it's simple enough to fix.
> 
> Signed-off-by: Dan Carpenter <dan.carpenter@...cle.com>
> 
> diff --git a/drivers/w1/w1.c b/drivers/w1/w1.c
> index 9eb816b2ea5e..b96f61b15dc6 100644
> --- a/drivers/w1/w1.c
> +++ b/drivers/w1/w1.c
> @@ -320,10 +320,10 @@ static ssize_t w1_master_attribute_show_timeout(struct device *dev, struct devic
>  static ssize_t w1_master_attribute_store_max_slave_count(struct device *dev,
>  	struct device_attribute *attr, const char *buf, size_t count)
>  {
> -	long tmp;
> +	int tmp;
>  	struct w1_master *md = dev_to_w1_master(dev);
>  
> -	if (kstrtol(buf, 0, &tmp) == -EINVAL || tmp < 1)
> +	if (kstrtoint(buf, 0, &tmp) == -EINVAL || tmp < 1)
>  		return -EINVAL;
>  
>  	mutex_lock(&md->mutex);

-- 
David Fries <david@...es.net>    PGP pub CB1EE8F0
http://fries.net/~david/
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