linux-kernel - Re: [patch] proc: copy_to

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Date:	Tue, 06 Apr 2010 10:17:56 -0500
From:	Matt Mackall <mpm@...enic.com>
To:	Dan Carpenter <error27@...il.com>,
	Linus Torvalds <torvalds@...uxfoundation.org>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>,
	Minchan Kim <minchan.kim@...il.com>,
	David Rientjes <rientjes@...gle.com>,
	linux-kernel@...r.kernel.org, kernel-janitors@...r.kernel.org
Subject: Re: [patch] proc: copy_to_user() returns unsigned

On Tue, 2010-04-06 at 13:45 +0300, Dan Carpenter wrote:
> copy_to_user() returns the number of bytes left to be copied.
> 
> This was a typo from: d82ef020cf31504c816803b1def94eb5ff173363
> "proc: pagemap: Hold mmap_sem during page walk".
> 
> Signed-off-by: Dan Carpenter <error27@...il.com>
> 
> diff --git a/fs/proc/task_mmu.c b/fs/proc/task_mmu.c
> index 0962739..bfb2773 100644
> --- a/fs/proc/task_mmu.c
> +++ b/fs/proc/task_mmu.c
> @@ -799,7 +799,7 @@ static ssize_t pagemap_read(struct file *file, char __user *buf,
>  		start_vaddr = end;
>  
>  		len = min(count, PM_ENTRY_BYTES * pm.pos);
> -		if (copy_to_user(buf, pm.buffer, len) < 0) {
> +		if (copy_to_user(buf, pm.buffer, len)) {
>  			ret = -EFAULT;
>  			goto out_free;
>  		}

Acked-by: Matt Mackall <mpm@...enic.com>

Linus, please take this one too.

-- 
http://selenic.com : development and support for Mercurial and Linux


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