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

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Message-ID: <20100403204717.GS24846@8bytes.org>
Date:	Sat, 3 Apr 2010 22:47:17 +0200
From:	Joerg Roedel <joro@...tes.org>
To:	Dan Carpenter <error27@...il.com>,
	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 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

> 
> 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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