linux-kernel - Re: [patch] 9p: strlen() doesn't count the terminator

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Message-Id: <20100712130458.bb8ae751.akpm@linux-foundation.org>
Date:	Mon, 12 Jul 2010 13:04:58 -0700
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Dan Carpenter <error27@...il.com>
Cc:	Eric Van Hensbergen <ericvh@...il.com>,
	"David S. Miller" <davem@...emloft.net>,
	Abhishek Kulkarni <adkulkar@...il.iu.edu>,
	Venkateswararao Jujjuri <jvrao@...ibm.com>,
	linux-kernel@...r.kernel.org,
	Tilman Sauerbeck <tilman@...e-monkey.de>,
	netdev@...r.kernel.org, kernel-janitors@...r.kernel.org
Subject: Re: [patch] 9p: strlen() doesn't count the terminator

On Sat, 10 Jul 2010 11:51:54 +0200
Dan Carpenter <error27@...il.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@...nel.org
> Signed-off-by: Dan Carpenter <error27@...il.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?

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