This is a note to let you know that I've just added the patch titled md: raid1: check rdev before reference in raid1_sync_request func to the 4.9-stable tree which can be found at: http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary The filename of the patch is: md-raid1-check-rdev-before-reference-in-raid1_sync_r.patch and it can be found in the queue-4.9 subdirectory. If you, or anyone else, feels it should not be added to the stable tree, please let <stable@xxxxxxxxxxxxxxx> know about it. commit a4eaa97f2c2f3b8c4da942551e8696873d6a70bd Author: Zhiqiang Liu <liuzhiqiang26@xxxxxxxxxx> Date: Tue Dec 10 10:42:25 2019 +0800 md: raid1: check rdev before reference in raid1_sync_request func [ Upstream commit 028288df635f5a9addd48ac4677b720192747944 ] In raid1_sync_request func, rdev should be checked before reference. Signed-off-by: Zhiqiang Liu <liuzhiqiang26@xxxxxxxxxx> Signed-off-by: Song Liu <songliubraving@xxxxxx> Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx> diff --git a/drivers/md/raid1.c b/drivers/md/raid1.c index 9892c41de441..8a50da4f148f 100644 --- a/drivers/md/raid1.c +++ b/drivers/md/raid1.c @@ -2633,7 +2633,7 @@ 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->bi_bdev = rdev->bdev;