linux-kernel - Re: [PATCH -mm] Introduce strtol_check

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Date:	Wed, 1 Aug 2007 09:35:09 +0400
From:	Alexey Dobriyan <adobriyan@...il.com>
To:	Satyam Sharma <satyam@...radead.org>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH -mm] Introduce strtol_check_range()

On Tue, Jul 31, 2007 at 10:04:10PM +0530, Satyam Sharma wrote:
> Callers (especially "store" functions for sysfs or configfs attributes)
> that want to convert an input string to a number may often also want to
> check for simple input sanity or allowable range. strtol10_check_range()
> of netconsole does this, so extract it out into lib/vsprintf.c, make it
> generic w.r.t. base, and export it to the rest of the kernel and modules.

> --- a/drivers/net/netconsole.c
> +++ b/drivers/net/netconsole.c
> @@ -335,9 +307,11 @@ static ssize_t store_enabled(struct netconsole_target *nt,
>  	int err;
>  	long enabled;
>  
> -	enabled = strtol10_check_range(buf, 0, 1);
> -	if (enabled < 0)
> +	enabled = strtol_check_range(buf, 0, 1, 10);
> +	if (enabled < 0) {
> +		printk(KERN_ERR "netconsole: invalid input\n");
>  		return enabled;
> +	}

Please, copy strtonum() from BSD instead. Nobody needs another
home-grown converter.

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