linux-kernel - [PATCH] md/raid5: fix miscalculation of 'end_sector' in raid5_read_one

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Message-Id: <20230524014118.3172781-1-yukuai1@huaweicloud.com>
Date:   Wed, 24 May 2023 09:41:18 +0800
From:   Yu Kuai <yukuai1@...weicloud.com>
To:     hch@....de, song@...nel.org, axboe@...nel.dk,
        chaitanya.kulkarni@....com, johannes.thumshirn@....com,
        damien.lemoal@....com
Cc:     linux-raid@...r.kernel.org, linux-kernel@...r.kernel.org,
        yukuai3@...wei.com, yukuai1@...weicloud.com, yi.zhang@...wei.com,
        yangerkun@...wei.com
Subject: [PATCH] md/raid5: fix miscalculation of 'end_sector' in raid5_read_one_chunk()

From: Yu Kuai <yukuai3@...wei.com>

'end_sector' is compared to 'rdev->recovery_offset', which is offset to
rdev, however, commit e82ed3a4fbb5 ("md/raid6: refactor
raid5_read_one_chunk") changes the calculation of 'end_sector' to offset
to the array. Fix this miscalculation.

Fixes: e82ed3a4fbb5 ("md/raid6: refactor raid5_read_one_chunk")
Signed-off-by: Yu Kuai <yukuai3@...wei.com>
---
 drivers/md/raid5.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/md/raid5.c b/drivers/md/raid5.c
index 7e2bbcfef325..8686d629e3f2 100644
--- a/drivers/md/raid5.c
+++ b/drivers/md/raid5.c
@@ -5516,7 +5516,7 @@ static int raid5_read_one_chunk(struct mddev *mddev, struct bio *raid_bio)
 
 	sector = raid5_compute_sector(conf, raid_bio->bi_iter.bi_sector, 0,
 				      &dd_idx, NULL);
-	end_sector = bio_end_sector(raid_bio);
+	end_sector = sector + bio_sectors(raid_bio);
 
 	rcu_read_lock();
 	if (r5c_big_stripe_cached(conf, sector))
-- 
2.39.2