This is a note to let you know that I've just added the patch titled
md: fix bi_status reporting in md_end_clone_io
to the 5.15-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-fix-bi_status-reporting-in-md_end_clone_io.patch
and it can be found in the queue-5.15 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 45b478951b2ba5aea70b2850c49c1aa83aedd0d2 Mon Sep 17 00:00:00 2001
From: Song Liu <song@xxxxxxxxxx>
Date: Fri, 17 Nov 2023 15:56:30 -0800
Subject: md: fix bi_status reporting in md_end_clone_io
From: Song Liu <song@xxxxxxxxxx>
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@xxxxxxxxxxxxxxx # v5.14+
Reported-by: Bhanu Victor DiCara <00bvd0+linux@xxxxxxxxx>
Closes: https://lore.kernel.org/regressions/5727380.DvuYhMxLoT@bvd0/
Signed-off-by: Song Liu <song@xxxxxxxxxx>
Tested-by: Xiao Ni <xni@xxxxxxxxxx>
Reviewed-by: Yu Kuai <yukuai3@xxxxxxxxxx>
Acked-by: Guoqing Jiang <guoqing.jiang@xxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/md/md.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
--- a/drivers/md/md.c
+++ b/drivers/md/md.c
@@ -8627,7 +8627,8 @@ static void md_end_io_acct(struct bio *b
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);
Patches currently in stable-queue which might be from song@xxxxxxxxxx are
queue-5.15/md-fix-bi_status-reporting-in-md_end_clone_io.patch
