linux-kernel - Re: [PATCH 3/3] ide: Fix cs5535 driver accessing beyond array boundary

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Date:	Thu, 18 Oct 2007 23:10:50 +0200
From:	Bartlomiej Zolnierkiewicz <bzolnier@...il.com>
To:	Benjamin Herrenschmidt <benh@...nel.crashing.org>
Cc:	Linux IDE <linux-ide@...r.kernel.org>,
	linux-kernel@...r.kernel.org, Andrew Morton <akpm@...l.org>,
	stable@...nel.org
Subject: Re: [PATCH 3/3] ide: Fix cs5535 driver accessing beyond array boundary

On Thursday 18 October 2007, Benjamin Herrenschmidt wrote:
> The cs5535 use an incorrect construct to access the other drive
> of a pair, causing it to access beyond an array boundary on non-0
> interfaces. This fixes it by using the new ide_get_paired_drive()
> hepler instead.
> 
> Signed-off-by: Benjamin Herrenschmidt <benh@...nel.crashing.org>

applied with patch description fixes

> ---
> 
>  drivers/ide/pci/cs5535.c |    2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> Index: linux-work/drivers/ide/pci/cs5535.c
> ===================================================================
> --- linux-work.orig/drivers/ide/pci/cs5535.c	2007-10-18 10:43:39.000000000 +1000
> +++ linux-work/drivers/ide/pci/cs5535.c	2007-10-18 10:44:00.000000000 +1000
> @@ -84,7 +84,7 @@ static void cs5535_set_speed(ide_drive_t
>  
>  	/* Set the PIO timings */
>  	if ((speed & XFER_MODE) == XFER_PIO) {
> -		ide_drive_t *pair = &drive->hwif->drives[drive->dn ^ 1];
> +		ide_drive_t *pair = ide_get_paired_drive(drive);
>  		u8 cmd, pioa;
>  
>  		cmd = pioa = speed - XFER_PIO_0;
-
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