md/raid10: fix memleak of md thread

[ Upstream commit f0ddb83da3cbbf8a1f9087a642c448ff52ee9abd ]

In raid10_run(), if setup_conf() succeed and raid10_run() failed before
setting 'mddev->thread', then in the error path 'conf->thread' is not
freed.

Fix the problem by setting 'mddev->thread' right after setup_conf().

Fixes: 43a521238aca ("md-cluster: choose correct label when clustered layout is not supported")
Signed-off-by: Yu Kuai <yukuai3@huawei.com>
Signed-off-by: Song Liu <song@kernel.org>
Link: https://lore.kernel.org/r/20230310073855.1337560-7-yukuai1@huaweicloud.com
Signed-off-by: Sasha Levin <sashal@kernel.org>

diff --git a/drivers/md/raid10.c b/drivers/md/raid10.c
index c861db5..006c28e 100644 (file)
--- a/drivers/md/raid10.c
+++ b/drivers/md/raid10.c
@@ -4148,6 +4148,9 @@ static int raid10_run(struct mddev *mddev)
        if (!conf)
                goto out;
 
+       mddev->thread = conf->thread;
+       conf->thread = NULL;
+
        if (mddev_is_clustered(conf->mddev)) {
                int fc, fo;
 
@@ -4160,9 +4163,6 @@ static int raid10_run(struct mddev *mddev)
                }
        }
 
-       mddev->thread = conf->thread;
-       conf->thread = NULL;
-
        if (mddev->queue) {
                blk_queue_max_write_zeroes_sectors(mddev->queue, 0);
                blk_queue_io_min(mddev->queue, mddev->chunk_sectors << 9);