ipc: fix memory leak in init_mqueue_fs()

[ Upstream commit 12b677f ]

When setup_mq_sysctls() failed in init_mqueue_fs(), mqueue_inode_cachep is
not released.  In order to fix this issue, the release path is reordered.

Link: https://lkml.kernel.org/r/20221209092929.1978875-1-shaozhengchao@huawei.com
Fixes: dc55e35 ("ipc: Store mqueue sysctls in the ipc namespace")
Signed-off-by: Zhengchao Shao <shaozhengchao@huawei.com>
Cc: Alexey Gladkov <legion@kernel.org>
Cc: "Eric W. Biederman" <ebiederm@xmission.com>
Cc: Jingyu Wang <jingyuwang_vip@163.com>
Cc: Muchun Song <songmuchun@bytedance.com>
Cc: Roman Gushchin <roman.gushchin@linux.dev>
Cc: Waiman Long <longman@redhat.com>
Cc: Wei Yongjun <weiyongjun1@huawei.com>
Cc: YueHaibing <yuehaibing@huawei.com>
Cc: Yu Zhe <yuzhe@nfschina.com>
Cc: Manfred Spraul <manfred@colorfullife.com>
Cc: Davidlohr Bueso <dave@stgolabs.net>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>

ipc/mqueue.c

@@ -1726,7 +1726,8 @@ static int __init init_mqueue_fs(void)
 
 	if (!setup_mq_sysctls(&init_ipc_ns)) {
 		pr_warn("sysctl registration failed\n");
-		return -ENOMEM;
+		error = -ENOMEM;
+		goto out_kmem;
 	}
 
 	error = register_filesystem(&mqueue_fs_type);
@@ -1744,8 +1745,9 @@ static int __init init_mqueue_fs(void)
 out_filesystem:
 	unregister_filesystem(&mqueue_fs_type);
 out_sysctl:
-	kmem_cache_destroy(mqueue_inode_cachep);
 	retire_mq_sysctls(&init_ipc_ns);
+out_kmem:
+	kmem_cache_destroy(mqueue_inode_cachep);
 	return error;
 }