linux-kernel - Re: [patch] NTB: fix pointer math issues

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Message-ID: <20130128025156.GE4687@jonmason-lab>
Date:	Sun, 27 Jan 2013 19:51:56 -0700
From:	Jon Mason <jon.mason@...el.com>
To:	Dan Carpenter <dan.carpenter@...cle.com>
Cc:	linux-kernel@...r.kernel.org, kernel-janitors@...r.kernel.org
Subject: Re: [patch] NTB: fix pointer math issues

On Wed, Jan 23, 2013 at 10:26:05PM +0300, Dan Carpenter wrote:
> ->remote_rx_info and ->rx_info are struct ntb_rx_info pointers.  If we
> add sizeof(struct ntb_rx_info) then it goes too far.

Good catch, I'll add it to me pending patch queue.

Thanks,
Jon

> 
> Signed-off-by: Dan Carpenter <dan.carpenter@...cle.com>
> ---
> 
> diff --git a/drivers/ntb/ntb_transport.c b/drivers/ntb/ntb_transport.c
> index e0bdfd7..676ee16 100644
> --- a/drivers/ntb/ntb_transport.c
> +++ b/drivers/ntb/ntb_transport.c
> @@ -486,7 +486,7 @@ static void ntb_transport_setup_qp_mw(struct ntb_transport *nt,
>  			     (qp_num / NTB_NUM_MW * rx_size);
>  	rx_size -= sizeof(struct ntb_rx_info);
>  
> -	qp->rx_buff = qp->remote_rx_info + sizeof(struct ntb_rx_info);
> +	qp->rx_buff = qp->remote_rx_info + 1;
>  	qp->rx_max_frame = min(transport_mtu, rx_size);
>  	qp->rx_max_entry = rx_size / qp->rx_max_frame;
>  	qp->rx_index = 0;
> @@ -780,7 +780,7 @@ static void ntb_transport_init_queue(struct ntb_transport *nt,
>  		      (qp_num / NTB_NUM_MW * tx_size);
>  	tx_size -= sizeof(struct ntb_rx_info);
>  
> -	qp->tx_mw = qp->rx_info + sizeof(struct ntb_rx_info);
> +	qp->tx_mw = qp->rx_info + 1;
>  	qp->tx_max_frame = min(transport_mtu, tx_size);
>  	qp->tx_max_entry = tx_size / qp->tx_max_frame;
>  	qp->tx_index = 0;
--
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