From mboxrd@z Thu Jan  1 00:00:00 1970
From: Andrew Morton <akpm@linux-foundation.org>
Date: Mon, 12 Jul 2010 20:04:58 +0000
Subject: Re: [patch] 9p: strlen() doesn't count the terminator
Message-Id: <20100712130458.bb8ae751.akpm@linux-foundation.org>
List-Id: <kernel-janitors.vger.kernel.org>
References: <20100710095154.GU19184@bicker>
In-Reply-To: <20100710095154.GU19184@bicker>
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To: Dan Carpenter <error27@gmail.com>
Cc: Eric Van Hensbergen <ericvh@gmail.com>, "David S. Miller" <davem@davemloft.net>, Abhishek Kulkarni <adkulkar@umail.iu.edu>, Venkateswararao Jujjuri <jvrao@us.ibm.com>, linux-kernel@vger.kernel.org, Tilman Sauerbeck <tilman@code-monkey.de>, netdev@vger.kernel.org, kernel-janitors@vger.kernel.org

On Sat, 10 Jul 2010 11:51:54 +0200
Dan Carpenter <error27@gmail.com> wrote:

> This is an off by one bug because strlen() doesn't count the NULL
> terminator.  We strcpy() addr into a fixed length array of size
> UNIX_PATH_MAX later on.
> 
> The addr variable is the name of the device being mounted.
> 
> CC: stable@kernel.org
> Signed-off-by: Dan Carpenter <error27@gmail.com>
> 
> diff --git a/net/9p/trans_fd.c b/net/9p/trans_fd.c
> index 98ce9bc..c85109d 100644
> --- a/net/9p/trans_fd.c
> +++ b/net/9p/trans_fd.c
> @@ -948,7 +948,7 @@ p9_fd_create_unix(struct p9_client *client, const char *addr, char *args)
>  
>  	csocket = NULL;
>  
> -	if (strlen(addr) > UNIX_PATH_MAX) {
> +	if (strlen(addr) >= UNIX_PATH_MAX) {
>  		P9_EPRINTK(KERN_ERR, "p9_trans_unix: address too long: %s\n",
>  			addr);
>  		return -ENAMETOOLONG;

This bug doesn't strike me as serious enough to warrant backporting the fix
into -stable.  What was your thinking there?