linux-kernel - [PATCH] net/sched: cbs: Fix error path of cbs_module

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Message-ID: <20190621134437.4252-1-yuehaibing@huawei.com>
Date:   Fri, 21 Jun 2019 21:44:37 +0800
From:   YueHaibing <yuehaibing@...wei.com>
To:     <jhs@...atatu.com>, <xiyou.wangcong@...il.com>, <jiri@...nulli.us>,
        <davem@...emloft.net>
CC:     <linux-kernel@...r.kernel.org>, <netdev@...r.kernel.org>,
        YueHaibing <yuehaibing@...wei.com>
Subject: [PATCH] net/sched: cbs: Fix error path of cbs_module_init

If register_qdisc fails, we should unregister
netdevice notifier.

Reported-by: Hulk Robot <hulkci@...wei.com>
Fixes: e0a7683d30e9 ("net/sched: cbs: fix port_rate miscalculation")
Signed-off-by: YueHaibing <yuehaibing@...wei.com>
---
 net/sched/sch_cbs.c | 9 +++++++--
 1 file changed, 7 insertions(+), 2 deletions(-)

diff --git a/net/sched/sch_cbs.c b/net/sched/sch_cbs.c
index e16a3d3..4e1a878 100644
--- a/net/sched/sch_cbs.c
+++ b/net/sched/sch_cbs.c
@@ -549,12 +549,17 @@ static struct notifier_block cbs_device_notifier = {
 
 static int __init cbs_module_init(void)
 {
-	int err = register_netdevice_notifier(&cbs_device_notifier);
+	int err;
 
+	err = register_netdevice_notifier(&cbs_device_notifier);
 	if (err)
 		return err;
 
-	return register_qdisc(&cbs_qdisc_ops);
+	err = register_qdisc(&cbs_qdisc_ops);
+	if (err)
+		unregister_netdevice_notifier(&cbs_device_notifier);
+
+	return err;
 }
 
 static void __exit cbs_module_exit(void)
-- 
2.7.4