From: Jens Axboe <axboe@kernel.dk>
To: "Martin K. Petersen" <martin.petersen@oracle.com>
Cc: linux-kernel@vger.kernel.org
Subject: Re: [PATCH] block: Fix bad range check in bio_sector_offset
Date: Wed, 29 Aug 2012 10:16:15 -0700 [thread overview]
Message-ID: <503E4E5F.5060003@kernel.dk> (raw)
In-Reply-To: <yq1a9xesxll.fsf@sermon.lab.mkp.net>
On 2012-08-28 11:03, Martin K. Petersen wrote:
>
> DM would occasionally end up splitting data integrity-enabled requests
> incorrectly. The culprit was a bad range check in bio_sector_offset.
>
> Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
> Cc: <stable@vger.kernel.org>
>
> diff --git a/fs/bio.c b/fs/bio.c
> index 9bfade8..b9a6744 100644
> --- a/fs/bio.c
> +++ b/fs/bio.c
> @@ -1552,8 +1552,8 @@ sector_t bio_sector_offset(struct bio *bio, unsigned short index,
> sector_sz = queue_logical_block_size(bio->bi_bdev->bd_disk->queue);
> sectors = 0;
>
> - if (index >= bio->bi_idx)
> - index = bio->bi_vcnt - 1;
> + if (index > bio->bi_vcnt)
> + return 0;
>
> __bio_for_each_segment(bv, bio, i, 0) {
> if (i == index) {
Good catch, merged.
--
Jens Axboe
prev parent reply other threads:[~2012-08-29 17:16 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-08-28 18:03 [PATCH] block: Fix bad range check in bio_sector_offset Martin K. Petersen
2012-08-29 14:07 ` Jeff Moyer
2012-08-29 16:19 ` Martin K. Petersen
2012-08-29 17:48 ` Jeff Moyer
2012-08-29 17:16 ` Jens Axboe [this message]
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