linux-kernel - Re: [PATCH] samples/kobject: Use kstrtoint instead of sscanf

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Date:	Fri, 19 Dec 2014 11:27:37 +1030
From:	Rusty Russell <rusty@...tcorp.com.au>
To:	Rastislav Barlik <barlik@...o.com>
Cc:	"greg KH" <gregkh@...uxfoundation.org>
Subject: Re: [PATCH] samples/kobject: Use kstrtoint instead of sscanf

Rastislav Barlik <barlik@...o.com> writes:
> Use kstrtoint function instead of sscanf and check for return values.
>
> Signed-off-by: Rastislav Barlik <barlik@...o.com>

Hmm, this seems like Greg, not me.

Greg, I noticed this in samples/kobject/kobject-example.c:

 * Released under the GPL version 2 only.
...
MODULE_LICENSE("GPL");

>From module.h:

 * The following license idents are currently accepted as indicating free
 * software modules
 *
 *	"GPL"				[GNU Public License v2 or later]
 *	"GPL v2"			[GNU Public License v2]

Cheers,
Rusty.

> ---
>  samples/kobject/kobject-example.c | 14 +++++++++++---
>  samples/kobject/kset-example.c    | 14 +++++++++++---
>  2 files changed, 22 insertions(+), 6 deletions(-)
>
> diff --git a/samples/kobject/kobject-example.c b/samples/kobject/kobject-example.c
> index 01562e0..063aaec 100644
> --- a/samples/kobject/kobject-example.c
> +++ b/samples/kobject/kobject-example.c
> @@ -36,7 +36,12 @@ static ssize_t foo_show(struct kobject *kobj, struct kobj_attribute *attr,
>  static ssize_t foo_store(struct kobject *kobj, struct kobj_attribute *attr,
>  			 const char *buf, size_t count)
>  {
> -	sscanf(buf, "%du", &foo);
> +	int ret;
> +
> +	ret = kstrtoint(buf, 10, &foo);
> +	if (ret < 0)
> +		return ret;
> +
>  	return count;
>  }
>  
> @@ -63,9 +68,12 @@ static ssize_t b_show(struct kobject *kobj, struct kobj_attribute *attr,
>  static ssize_t b_store(struct kobject *kobj, struct kobj_attribute *attr,
>  		       const char *buf, size_t count)
>  {
> -	int var;
> +	int var, ret;
> +
> +	ret = kstrtoint(buf, 10, &var);
> +	if (ret < 0)
> +		return ret;
>  
> -	sscanf(buf, "%du", &var);
>  	if (strcmp(attr->attr.name, "baz") == 0)
>  		baz = var;
>  	else
> diff --git a/samples/kobject/kset-example.c b/samples/kobject/kset-example.c
> index ab5e447..e80ced3 100644
> --- a/samples/kobject/kset-example.c
> +++ b/samples/kobject/kset-example.c
> @@ -120,7 +120,12 @@ static ssize_t foo_show(struct foo_obj *foo_obj, struct foo_attribute *attr,
>  static ssize_t foo_store(struct foo_obj *foo_obj, struct foo_attribute *attr,
>  			 const char *buf, size_t count)
>  {
> -	sscanf(buf, "%du", &foo_obj->foo);
> +	int ret;
> +
> +	ret = kstrtoint(buf, 10, &foo_obj->foo);
> +	if (ret < 0)
> +		return ret;
> +
>  	return count;
>  }
>  
> @@ -147,9 +152,12 @@ static ssize_t b_show(struct foo_obj *foo_obj, struct foo_attribute *attr,
>  static ssize_t b_store(struct foo_obj *foo_obj, struct foo_attribute *attr,
>  		       const char *buf, size_t count)
>  {
> -	int var;
> +	int var, ret;
> +
> +	ret = kstrtoint(buf, 10, &var);
> +	if (ret < 0)
> +		return ret;
>  
> -	sscanf(buf, "%du", &var);
>  	if (strcmp(attr->attr.name, "baz") == 0)
>  		foo_obj->baz = var;
>  	else
> -- 
> 2.1.3
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