linux-kernel - Re: [PATCH] spi_mpc8xxx: fix buffer overrun when sending only/receiving only more than PAGE

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Date:	Thu, 16 Sep 2010 14:15:26 -0600
From:	Grant Likely <grant.likely@...retlab.ca>
To:	christophe leroy <christophe.leroy@....fr>
Cc:	David Brownell <dbrownell@...rs.sourceforge.net>,
	spi-devel-general@...ts.sourceforge.net,
	linux-kernel@...r.kernel.org, linuxppc-dev@...ts.ozlabs.org
Subject: Re: [PATCH] spi_mpc8xxx: fix buffer overrun when sending
 only/receiving only more than PAGE_SIZE bytes

On Thu, Sep 16, 2010 at 09:05:25AM +0200, christophe leroy wrote:
> This patch applies to 2.6.34.7 and 2.6.35.4
> It fixes an issue when sending only or receiving only more than PAGE_SIZE bytes
> 
> Signed-off-by: christophe leroy <christophe.leroy@....fr>

applied to merge-spi branch, thanks.

g.

> 
> diff -urN c/drivers/spi/spi_mpc8xxx.c d/drivers/spi/spi_mpc8xxx.c
> --- c/drivers/spi/spi_mpc8xxx.c	2010-09-08 16:44:03.000000000 +0200
> +++ d/drivers/spi/spi_mpc8xxx.c	2010-09-08 16:44:14.000000000 +0200
> @@ -393,11 +393,17 @@
>  
>  	xfer_ofs = mspi->xfer_in_progress->len - mspi->count;
>  
> -	out_be32(&rx_bd->cbd_bufaddr, mspi->rx_dma + xfer_ofs);
> +	if (mspi->rx_dma == mspi->dma_dummy_rx)
> +		out_be32(&rx_bd->cbd_bufaddr, mspi->rx_dma);
> +	else
> +		out_be32(&rx_bd->cbd_bufaddr, mspi->rx_dma + xfer_ofs);
>  	out_be16(&rx_bd->cbd_datlen, 0);
>  	out_be16(&rx_bd->cbd_sc, BD_SC_EMPTY | BD_SC_INTRPT | BD_SC_WRAP);
>  
> -	out_be32(&tx_bd->cbd_bufaddr, mspi->tx_dma + xfer_ofs);
> +	if (mspi->tx_dma == mspi->dma_dummy_tx)
> +		out_be32(&tx_bd->cbd_bufaddr, mspi->tx_dma);
> +	else
> +		out_be32(&tx_bd->cbd_bufaddr, mspi->tx_dma + xfer_ofs);
>  	out_be16(&tx_bd->cbd_datlen, xfer_len);
>  	out_be16(&tx_bd->cbd_sc, BD_SC_READY | BD_SC_INTRPT | BD_SC_WRAP |
>  				 BD_SC_LAST);
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