linux-kernel - Re: [PATCH] fs/proc/task_mmu.c: fix clear_refs

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Date:	Wed, 12 Aug 2009 15:24:09 -0700 (PDT)
From:	David Rientjes <rientjes@...gle.com>
To:	Vincent Li <macli@....ubc.ca>
cc:	linux-kernel@...r.kernel.org,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [PATCH] fs/proc/task_mmu.c: fix clear_refs_write() input sanity
 check

On Wed, 12 Aug 2009, Vincent Li wrote:

> diff --git a/fs/proc/task_mmu.c b/fs/proc/task_mmu.c
> index 2079969..026b532 100644
> --- a/fs/proc/task_mmu.c
> +++ b/fs/proc/task_mmu.c
> @@ -494,18 +494,17 @@ static ssize_t clear_refs_write(struct file *file, const char __user *buf,
>  	char buffer[PROC_NUMBUF], *end;
>  	struct mm_struct *mm;
>  	struct vm_area_struct *vma;
> -	int type;
> +	long res;
>  

What does `res' mean?  Why can't it just be left as `type'?

>  	memset(buffer, 0, sizeof(buffer));
>  	if (count > sizeof(buffer) - 1)
>  		count = sizeof(buffer) - 1;
>  	if (copy_from_user(buffer, buf, count))
>  		return -EFAULT;
> -	type = simple_strtol(buffer, &end, 0);
> -	if (type < CLEAR_REFS_ALL || type > CLEAR_REFS_MAPPED)
> +	if (strict_strtol(strstrip(buffer), 10, &res)
> +		return -EINVAL;

Please test your patch submissions (which would require that the above 
actually compiles).
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