linux-kernel - Re: [patch] dma-debug: off by one issue

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Date:	Mon, 5 Apr 2010 15:53:30 +0300
From:	Dan Carpenter <error27@...il.com>
To:	Joerg Roedel <joro@...tes.org>
Cc:	Joerg Roedel <joerg.roedel@....com>, Ingo Molnar <mingo@...e.hu>,
	FUJITA Tomonori <fujita.tomonori@....ntt.co.jp>,
	Shaun Ruffell <sruffell@...ium.com>,
	linux-kernel@...r.kernel.org, kernel-janitors@...r.kernel.org
Subject: Re: [patch] dma-debug: off by one issue

On Sat, Apr 03, 2010 at 10:47:17PM +0200, Joerg Roedel wrote:
> On Fri, Apr 02, 2010 at 02:28:43PM +0300, Dan Carpenter wrote:
> > We need to reserve the last character for the NULL terminator.
> 
> The character is already reserved by the user-to-kernel copy earlier in
> the function.
> 
> 	Joerg
> 

Yes, but the original code requires more code reading to audit. Let's 
change the commit message to say that it's a clean up patch.

regards,
dan carpenter

> > 
> > Signed-off-by: Dan Carpenter <error27@...il.com>
> > 
> > diff --git a/lib/dma-debug.c b/lib/dma-debug.c
> > index ba8b670..01e6427 100644
> > --- a/lib/dma-debug.c
> > +++ b/lib/dma-debug.c
> > @@ -570,7 +570,7 @@ static ssize_t filter_write(struct file *file, const char __user *userbuf,
> >  	 * Now parse out the first token and use it as the name for the
> >  	 * driver to filter for.
> >  	 */
> > -	for (i = 0; i < NAME_MAX_LEN; ++i) {
> > +	for (i = 0; i < NAME_MAX_LEN - 1; ++i) {
> >  		current_driver_name[i] = buf[i];
> >  		if (isspace(buf[i]) || buf[i] == ' ' || buf[i] == 0)
> >  			break;
> --
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