linux-kernel - Re: [PATCH 01/14] ide-tape: fix potential fs requests bug

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Date:	Sat, 9 May 2009 10:02:45 +0200
From:	Sam Ravnborg <sam@...nborg.org>
To:	Borislav Petkov <petkovbb@...glemail.com>
Cc:	bzolnier@...il.com, linux-ide@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 01/14] ide-tape: fix potential fs requests bug

On Sat, May 09, 2009 at 09:45:21AM +0200, Borislav Petkov wrote:
> ide-tape had a potential bug for fs requests when preparing the command
> packet: it was writing the transfer length as a number of fixed blocks.
> However, the block layer implies 512 byte blocks and ide-tape can have
> other block sizes so account for that too.
> 
> ide-floppy does this calculation properly with the block size factor
> (floppy->bs_factor).
> 
> Signed-off-by: Borislav Petkov <petkovbb@...il.com>
> ---
>  drivers/ide/ide-tape.c |    2 +-
>  1 files changed, 1 insertions(+), 1 deletions(-)
> 
> diff --git a/drivers/ide/ide-tape.c b/drivers/ide/ide-tape.c
> index e166045..fc79cf4 100644
> --- a/drivers/ide/ide-tape.c
> +++ b/drivers/ide/ide-tape.c
> @@ -586,7 +586,7 @@ static void ide_tape_create_rw_cmd(idetape_tape_t *tape,
>  				   struct ide_atapi_pc *pc, struct request *rq,
>  				   u8 opcode)
>  {
> -	unsigned int length = blk_rq_sectors(rq);
> +	unsigned int length = blk_rq_sectors(rq) / (tape->blk_size >> 9);

If tape->blk_size equals 256 or less then we get a divide-by-zero.

	Sam
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