linux-kernel - [PATCH 6.0 606/862] ipc: mqueue: fix possible memory leak in init_mqueue

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Message-Id: <20221019083316.717671409@linuxfoundation.org>
Date:   Wed, 19 Oct 2022 10:31:33 +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, Hangyu Hua <hbh25y@...il.com>,
        "Eric W. Biederman" <ebiederm@...ssion.com>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH 6.0 606/862] ipc: mqueue: fix possible memory leak in init_mqueue_fs()

From: Hangyu Hua <hbh25y@...il.com>

[ Upstream commit c579d60f0d0cd87552f64fdebe68b5d941d20309 ]

commit db7cfc380900 ("ipc: Free mq_sysctls if ipc namespace creation
failed")

Here's a similar memory leak to the one fixed by the patch above.
retire_mq_sysctls need to be called when init_mqueue_fs fails after
setup_mq_sysctls.

Fixes: dc55e35f9e81 ("ipc: Store mqueue sysctls in the ipc namespace")
Signed-off-by: Hangyu Hua <hbh25y@...il.com>
Link: https://lkml.kernel.org/r/20220715062301.19311-1-hbh25y@gmail.com
Signed-off-by: Eric W. Biederman <ebiederm@...ssion.com>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 ipc/mqueue.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/ipc/mqueue.c b/ipc/mqueue.c
index f98de32aeea1..9cf314b3f079 100644
--- a/ipc/mqueue.c
+++ b/ipc/mqueue.c
@@ -1746,6 +1746,7 @@ static int __init init_mqueue_fs(void)
 	unregister_filesystem(&mqueue_fs_type);
 out_sysctl:
 	kmem_cache_destroy(mqueue_inode_cachep);
+	retire_mq_sysctls(&init_ipc_ns);
 	return error;
 }
 
-- 
2.35.1