linux-kernel - [PATCH 4.19 443/639] net/sched: cbs: Fix error path of cbs_module

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Date:   Fri, 24 Jan 2020 10:30:13 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Hulk Robot <hulkci@...wei.com>,
        YueHaibing <yuehaibing@...wei.com>,
        "David S. Miller" <davem@...emloft.net>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH 4.19 443/639] net/sched: cbs: Fix error path of cbs_module_init

From: YueHaibing <yuehaibing@...wei.com>

[ Upstream commit 45d5cb137c3638b3a310f41b31d8e79daf647f14 ]

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>
Signed-off-by: David S. Miller <davem@...emloft.net>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 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 81f84cb5dd23b..b3c8d04929df2 100644
--- a/net/sched/sch_cbs.c
+++ b/net/sched/sch_cbs.c
@@ -552,12 +552,17 @@ 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)
-- 
2.20.1