From fa9bacc1d5d6f32474370e8cc9a41dadf0a55de5 Mon Sep 17 00:00:00 2001 From: Song Liu Date: Fri, 17 Nov 2023 15:56:30 -0800 Subject: [PATCH] md: fix bi_status reporting in md_end_clone_io commit 45b478951b2ba5aea70b2850c49c1aa83aedd0d2 upstream. md_end_clone_io() may overwrite error status in orig_bio->bi_status with BLK_STS_OK. This could happen when orig_bio has BIO_CHAIN (split by md_submit_bio => bio_split_to_limits, for example). As a result, upper layer may miss error reported from md (or the device) and consider the failed IO was successful. Fix this by only update orig_bio->bi_status when current bio reports error and orig_bio is BLK_STS_OK. This is the same behavior as __bio_chain_endio(). Fixes: 10764815ff47 ("md: add io accounting for raid0 and raid5") Cc: stable@vger.kernel.org # v5.14+ Reported-by: Bhanu Victor DiCara <00bvd0+linux@gmail.com> Closes: https://lore.kernel.org/regressions/5727380.DvuYhMxLoT@bvd0/ Signed-off-by: Song Liu Tested-by: Xiao Ni Reviewed-by: Yu Kuai Acked-by: Guoqing Jiang Signed-off-by: Greg Kroah-Hartman --- drivers/md/md.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/drivers/md/md.c b/drivers/md/md.c index e87507d29895..20f67edae95d 100644 --- a/drivers/md/md.c +++ b/drivers/md/md.c @@ -8648,7 +8648,8 @@ static void md_end_io_acct(struct bio *bio) struct md_io_acct *md_io_acct = bio->bi_private; struct bio *orig_bio = md_io_acct->orig_bio; - orig_bio->bi_status = bio->bi_status; + if (bio->bi_status && !orig_bio->bi_status) + orig_bio->bi_status = bio->bi_status; bio_end_io_acct(orig_bio, md_io_acct->start_time); bio_put(bio);