linux-kernel - [PATCH -next v2 1/3] md/dm-raid: fix that 'reconfig_mutex' is not released from error path in raid

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Message-Id: <20230708092153.1418570-2-yukuai1@huaweicloud.com>
Date:   Sat,  8 Jul 2023 17:21:51 +0800
From:   Yu Kuai <yukuai1@...weicloud.com>
To:     pmenzel@...gen.mpg.de, agk@...hat.com, snitzer@...nel.org,
        dm-devel@...hat.com, song@...nel.org, heinzm@...hat.com,
        neilb@...e.de, jbrassow@...hat.com
Cc:     linux-kernel@...r.kernel.org, linux-raid@...r.kernel.org,
        yukuai3@...wei.com, yukuai1@...weicloud.com, yi.zhang@...wei.com,
        yangerkun@...wei.com
Subject: [PATCH -next v2 1/3] md/dm-raid: fix that 'reconfig_mutex' is not released from error path in raid_ctr()

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

In the error path 'bad_stripe_cache' and 'bad_check_reshape',
'reconfig_mutex' is still held after raid_ctr() returns.

Fixes: 9dbd1aa3a81c ("dm raid: add reshaping support to the target")
Signed-off-by: Yu Kuai <yukuai3@...wei.com>
---
 drivers/md/dm-raid.c | 9 +++++++--
 1 file changed, 7 insertions(+), 2 deletions(-)

diff --git a/drivers/md/dm-raid.c b/drivers/md/dm-raid.c
index 1f22bef27841..4c819d5f93fd 100644
--- a/drivers/md/dm-raid.c
+++ b/drivers/md/dm-raid.c
@@ -3271,15 +3271,19 @@ static int raid_ctr(struct dm_target *ti, unsigned int argc, char **argv)
 	/* Try to adjust the raid4/5/6 stripe cache size to the stripe size */
 	if (rs_is_raid456(rs)) {
 		r = rs_set_raid456_stripe_cache(rs);
-		if (r)
+		if (r) {
+			mddev_unlock(&rs->md);
 			goto bad_stripe_cache;
+		}
 	}
 
 	/* Now do an early reshape check */
 	if (test_bit(RT_FLAG_RESHAPE_RS, &rs->runtime_flags)) {
 		r = rs_check_reshape(rs);
-		if (r)
+		if (r) {
+			mddev_unlock(&rs->md);
 			goto bad_check_reshape;
+		}
 
 		/* Restore new, ctr requested layout to perform check */
 		rs_config_restore(rs, &rs_layout);
@@ -3288,6 +3292,7 @@ static int raid_ctr(struct dm_target *ti, unsigned int argc, char **argv)
 			r = rs->md.pers->check_reshape(&rs->md);
 			if (r) {
 				ti->error = "Reshape check failed";
+				mddev_unlock(&rs->md);
 				goto bad_check_reshape;
 			}
 		}
-- 
2.39.2