linux-kernel - Re: [PATCH] libata: Avoid overflow in ata_tf_read_block() when tf->hba

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Date:	Tue, 11 Nov 2008 03:02:14 -0500
From:	Jeff Garzik <jeff@...zik.org>
To:	Roland Dreier <rdreier@...co.com>
CC:	Phillip O'Donnell <phillip.odonnell@...il.com>,
	Oskar Liljeblad <oskar@....mine.nu>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] libata: Avoid overflow in ata_tf_read_block() when tf->hba_lbal
 > 127

Roland Dreier wrote:
> Phillip O'Donnell <phillip.odonnell@...il.com> pointed out that the same
> sign extension bug that was fixed in commit ba14a9c2 ("libata: Avoid
> overflow in ata_tf_to_lba48() when tf->hba_lbal > 127") also appears to
> exist in ata_tf_read_block().  Fix this by adding a cast to u64.
> 
> Signed-off-by: Roland Dreier <rolandd@...co.com>
> ---
> I don't have any way to test this -- I guess you would have to get an
> error on a block above 2G (ie data above 1TB)?  But it looks "obviously
> correct" enough to add to -next I guess.
> 
>  drivers/ata/libata-core.c |    2 +-
>  1 files changed, 1 insertions(+), 1 deletions(-)
> 
> diff --git a/drivers/ata/libata-core.c b/drivers/ata/libata-core.c
> index 622350d..a6ad862 100644
> --- a/drivers/ata/libata-core.c
> +++ b/drivers/ata/libata-core.c
> @@ -612,7 +612,7 @@ u64 ata_tf_read_block(struct ata_taskfile *tf, struct ata_device *dev)
>  		if (tf->flags & ATA_TFLAG_LBA48) {
>  			block |= (u64)tf->hob_lbah << 40;
>  			block |= (u64)tf->hob_lbam << 32;
> -			block |= tf->hob_lbal << 24;
> +			block |= (u64)tf->hob_lbal << 24;
>  		} else
>  			block |= (tf->device & 0xf) << 24;

applied


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