[2/3] batman-adv: No deact of aggregation on wrong input

A non-integer changes the aggregation mode. Therefore this patch changes
the behaviour to explicitly check strict_strtoul()'s return code.

Signed-off-by: Linus Lüssing <linus.luessing@web.de>
---
 proc.c |   24 ++++++++++++------------
 1 files changed, 12 insertions(+), 12 deletions(-)

Hello Linus,

thank you for the patch, applied with minor style changes in svn revision 1528.

best regards,
	Simon

On Thu, Dec 31, 2009 at 04:39:55AM +0100, =?UTF-8?q?Linus=20L=C3=BCssing?= wrote:
> A non-integer changes the aggregation mode. Therefore this patch changes
> the behaviour to explicitly check strict_strtoul()'s return code.
> 
> Signed-off-by: Linus Lüssing <linus.luessing@web.de>
> ---
>  proc.c |   24 ++++++++++++------------
>  1 files changed, 12 insertions(+), 12 deletions(-)
> 
> diff --git a/proc.c b/proc.c
> index e7b7bf3..232efe3 100644
> --- a/proc.c
> +++ b/proc.c
> @@ -433,6 +433,7 @@ static ssize_t proc_aggr_write(struct file *file, const char __user *buffer,
>  	char *aggr_string;
>  	int not_copied = 0;
>  	unsigned long aggregation_enabled_tmp;
> +	int retval;
>  
>  	aggr_string = kmalloc(count, GFP_KERNEL);
>  
> @@ -442,22 +443,21 @@ static ssize_t proc_aggr_write(struct file *file, const char __user *buffer,
>  	not_copied = copy_from_user(aggr_string, buffer, count);
>  	aggr_string[count - not_copied - 1] = 0;
>  
> -	strict_strtoul(aggr_string, 10, &aggregation_enabled_tmp);
> +	retval = strict_strtoul(aggr_string, 10, &aggregation_enabled_tmp);
>  
> -	if ((aggregation_enabled_tmp != 0) && (aggregation_enabled_tmp != 1)) {
> +	if (retval == -EINVAL || aggregation_enabled_tmp > 1) {
>  		printk(KERN_ERR "batman-adv:Aggregation can only be enabled (1) or disabled (0), given value: %li\n", aggregation_enabled_tmp);
> -		goto end;
> +	}
> +	else {
> +		printk(KERN_INFO "batman-adv:Changing aggregation from: %s (%i) to: %s (%li)\n",
> +		       (atomic_read(&aggregation_enabled) == 1 ?
> +			"enabled" : "disabled"),
> +		       atomic_read(&aggregation_enabled),
> +		       (aggregation_enabled_tmp == 1 ? "enabled" : "disabled"),
> +		       aggregation_enabled_tmp);
> +		atomic_set(&aggregation_enabled, (unsigned)aggregation_enabled_tmp);
>  	}
>  
> -	printk(KERN_INFO "batman-adv:Changing aggregation from: %s (%i) to: %s (%li)\n",
> -	       (atomic_read(&aggregation_enabled) == 1 ?
> -		"enabled" : "disabled"),
> -	       atomic_read(&aggregation_enabled),
> -	       (aggregation_enabled_tmp == 1 ? "enabled" : "disabled"),
> -	       aggregation_enabled_tmp);
> -
> -	atomic_set(&aggregation_enabled, (unsigned)aggregation_enabled_tmp);
> -end:
>  	kfree(aggr_string);
>  	return count;
>  }
> -- 
> 1.6.5.7
> 
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