linux-kernel - [PATCH 5.17 770/772] md: fix double free of io_acct

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Date:   Tue,  7 Jun 2022 19:06:02 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Xiao Ni <xni@...hat.com>,
        Song Liu <song@...nel.org>
Subject: [PATCH 5.17 770/772] md: fix double free of io_acct_set bioset

From: Xiao Ni <xni@...hat.com>

commit 42b805af102471f53e3c7867b8c2b502ea4eef7e upstream.

Now io_acct_set is alloc and free in personality. Remove the codes that
free io_acct_set in md_free and md_stop.

Fixes: 0c031fd37f69 (md: Move alloc/free acct bioset in to personality)
Signed-off-by: Xiao Ni <xni@...hat.com>
Signed-off-by: Song Liu <song@...nel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 drivers/md/md.c |    4 ----
 1 file changed, 4 deletions(-)

--- a/drivers/md/md.c
+++ b/drivers/md/md.c
@@ -5600,8 +5600,6 @@ static void md_free(struct kobject *ko)
 
 	bioset_exit(&mddev->bio_set);
 	bioset_exit(&mddev->sync_set);
-	if (mddev->level != 1 && mddev->level != 10)
-		bioset_exit(&mddev->io_acct_set);
 	kfree(mddev);
 }
 
@@ -6288,8 +6286,6 @@ void md_stop(struct mddev *mddev)
 	__md_stop(mddev);
 	bioset_exit(&mddev->bio_set);
 	bioset_exit(&mddev->sync_set);
-	if (mddev->level != 1 && mddev->level != 10)
-		bioset_exit(&mddev->io_acct_set);
 }
 
 EXPORT_SYMBOL_GPL(md_stop);