From:   Yu Kuai <yukuai1@huaweicloud.com>
To:     guoqing.jiang@linux.dev, song@kernel.org, jgq516@gmail.com,
        neilb@suse.de, shli@fb.com, lzhong@suse.com
Cc:     linux-raid@vger.kernel.org, linux-kernel@vger.kernel.org,
        yukuai3@huawei.com, yukuai1@huaweicloud.com, yi.zhang@huawei.com,
        yangerkun@huawei.com
Subject: [PATCH v2 6/6] md/raid10: fix memleak of md thread
Date:   Fri, 10 Mar 2023 15:38:55 +0800
Message-Id: <20230310073855.1337560-7-yukuai1@huaweicloud.com>
In-Reply-To: <20230310073855.1337560-1-yukuai1@huaweicloud.com>
References: <20230310073855.1337560-1-yukuai1@huaweicloud.com>
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From: Yu Kuai <yukuai3@huawei.com>

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>
---
 drivers/md/raid10.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/drivers/md/raid10.c b/drivers/md/raid10.c
index bdfa02e8fe7e..2f1522bba80d 100644
--- a/drivers/md/raid10.c
+++ b/drivers/md/raid10.c
@@ -4142,6 +4142,9 @@ 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;
 
@@ -4154,9 +4157,6 @@ 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);
-- 
2.31.1