linux-kernel - [PATCH v2 6/6] md/raid10: fix memleak of md thread

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Date:   Fri, 10 Mar 2023 15:38:55 +0800
From:   Yu Kuai <yukuai1@...weicloud.com>
To:     guoqing.jiang@...ux.dev, song@...nel.org, jgq516@...il.com,
        neilb@...e.de, shli@...com, lzhong@...e.com
Cc:     linux-raid@...r.kernel.org, linux-kernel@...r.kernel.org,
        yukuai3@...wei.com, yukuai1@...weicloud.com, yi.zhang@...wei.com,
        yangerkun@...wei.com
Subject: [PATCH v2 6/6] md/raid10: fix memleak of md thread

From: Yu Kuai <yukuai3@...wei.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@...wei.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