From: Xiao Ni xni@redhat.com

commit 3db4404435397a345431b45f57876a3df133f3b4 upstream.

raid10_handle_discard should wait barrier before returning a discard bio which has REQ_NOWAIT. And there is no need to print warning calltrace if a discard bio has REQ_NOWAIT flag. Quality engineer usually checks dmesg and reports error if dmesg has warning/error calltrace.

Fixes: c9aa889b035f ("md: raid10 add nowait support") Signed-off-by: Xiao Ni xni@redhat.com Acked-by: Coly Li colyli@kernel.org Link: https://lore.kernel.org/linux-raid/20250306094938.48952-1-xni@redhat.com Signed-off-by: Yu Kuai yukuai3@huawei.com Signed-off-by: Daniil Dulov d.dulov@aladdin.ru --- Backport fix for CVE-2025-40325.

drivers/md/raid10.c | 3 +-- 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/drivers/md/raid10.c b/drivers/md/raid10.c index cc194f6ec18d..a02c02684237 100644 --- a/drivers/md/raid10.c +++ b/drivers/md/raid10.c @@ -1585,11 +1585,10 @@ static int raid10_handle_discard(struct mddev *mddev, struct bio *bio) if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery)) return -EAGAIN;

- if (WARN_ON_ONCE(bio->bi_opf & REQ_NOWAIT)) { + if (!wait_barrier(conf, bio->bi_opf & REQ_NOWAIT)) { bio_wouldblock_error(bio); return 0; } - wait_barrier(conf, false);

/* * Check reshape again to avoid reshape happens after checking