netdev - Re: [PATCH 9/9] sunrpc: auth_gss: misused copy_to

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Date:	Fri, 30 Jul 2010 13:48:04 -0400
From:	Trond Myklebust <Trond.Myklebust@...app.com>
To:	Kulikov Vasiliy <segooon@...il.com>
Cc:	kernel-janitors@...r.kernel.org,
	"J. Bruce Fields" <bfields@...ldses.org>,
	Neil Brown <neilb@...e.de>,
	"David S. Miller" <davem@...emloft.net>,
	Jeff Layton <jlayton@...hat.com>,
	Steve Dickson <steved@...hat.com>,
	Suresh Jayaraman <sjayaraman@...e.de>,
	Kevin Coffman <kwc@...i.umich.edu>, linux-nfs@...r.kernel.org,
	netdev@...r.kernel.org
Subject: Re: [PATCH 9/9] sunrpc: auth_gss: misused copy_to_user() return
 value

On Fri, 2010-07-30 at 15:10 +0400, Kulikov Vasiliy wrote:
> copy_to_user() returns nonzero value on error, this value may be any
> value between 0 and requested count, not only requested count.
> 
> Signed-off-by: Kulikov Vasiliy <segooon@...il.com>
> ---
>  net/sunrpc/auth_gss/auth_gss.c |    2 +-
>  1 files changed, 1 insertions(+), 1 deletions(-)
> 
> diff --git a/net/sunrpc/auth_gss/auth_gss.c b/net/sunrpc/auth_gss/auth_gss.c
> index 8da2a0e..232d7dc 100644
> --- a/net/sunrpc/auth_gss/auth_gss.c
> +++ b/net/sunrpc/auth_gss/auth_gss.c
> @@ -610,7 +610,7 @@ gss_pipe_upcall(struct file *filp, struct rpc_pipe_msg *msg,
>  	unsigned long left;
>  
>  	left = copy_to_user(dst, data, mlen);
> -	if (left == mlen) {
> +	if (left)
>  		msg->errno = -EFAULT;
>  		return -EFAULT;
>  	}

Ditto unnecessary...

Trond
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