linux-kernel - [PATCH AUTOSEL 4.19 27/34] md: raid1: check rdev before reference in raid1_sync

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Message-Id: <20191220143433.9922-27-sashal@kernel.org>
Date:   Fri, 20 Dec 2019 09:34:26 -0500
From:   Sasha Levin <sashal@...nel.org>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:     Zhiqiang Liu <liuzhiqiang26@...wei.com>,
        Song Liu <songliubraving@...com>,
        Sasha Levin <sashal@...nel.org>, linux-raid@...r.kernel.org
Subject: [PATCH AUTOSEL 4.19 27/34] md: raid1: check rdev before reference in raid1_sync_request func

From: Zhiqiang Liu <liuzhiqiang26@...wei.com>

[ Upstream commit 028288df635f5a9addd48ac4677b720192747944 ]

In raid1_sync_request func, rdev should be checked before reference.

Signed-off-by: Zhiqiang Liu <liuzhiqiang26@...wei.com>
Signed-off-by: Song Liu <songliubraving@...com>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/md/raid1.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/md/raid1.c b/drivers/md/raid1.c
index 6800dcd50a11b..abcb4c3a76c18 100644
--- a/drivers/md/raid1.c
+++ b/drivers/md/raid1.c
@@ -2756,7 +2756,7 @@ static sector_t raid1_sync_request(struct mddev *mddev, sector_t sector_nr,
 				write_targets++;
 			}
 		}
-		if (bio->bi_end_io) {
+		if (rdev && bio->bi_end_io) {
 			atomic_inc(&rdev->nr_pending);
 			bio->bi_iter.bi_sector = sector_nr + rdev->data_offset;
 			bio_set_dev(bio, rdev->bdev);
-- 
2.20.1