linux-kernel - [PATCH] ipc: mqueue: fix possible memory leak in init_mqueue

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Date:   Fri, 15 Jul 2022 14:23:01 +0800
From:   Hangyu Hua <hbh25y@...il.com>
To:     akpm@...ux-foundation.org, songmuchun@...edance.com,
        longman@...hat.com, roman.gushchin@...ux.dev,
        ebiederm@...ssion.com, legion@...nel.org
Cc:     linux-kernel@...r.kernel.org, Hangyu Hua <hbh25y@...il.com>
Subject: [PATCH] ipc: mqueue: fix possible memory leak in init_mqueue_fs()

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>
---
 ipc/mqueue.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/ipc/mqueue.c b/ipc/mqueue.c
index 12ad7860bb88..83370fef8879 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;
 }
 
-- 
2.25.1