linux-kernel - [PATCH v1] net/8021q/vlan: check the return value of vlan_vid

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Message-Id: <20220919074600.1576168-1-floridsleeves@gmail.com>
Date:   Mon, 19 Sep 2022 00:46:00 -0700
From:   Li Zhong <floridsleeves@...il.com>
To:     linux-kernel@...r.kernel.org, netdev@...r.kernel.org
Cc:     jgg@...pe.ca, william.xuanziyang@...wei.com, pabeni@...hat.com,
        kuba@...nel.org, edumazet@...gle.com, davem@...emloft.net,
        Li Zhong <floridsleeves@...il.com>
Subject: [PATCH v1] net/8021q/vlan: check the return value of vlan_vid_add()

Check the return value of vlan_vid_add() which could fail and return
error code.

Signed-off-by: Li Zhong <floridsleeves@...il.com>
---
 net/8021q/vlan.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/net/8021q/vlan.c b/net/8021q/vlan.c
index e40aa3e3641c..e96aefd00a6e 100644
--- a/net/8021q/vlan.c
+++ b/net/8021q/vlan.c
@@ -382,7 +382,10 @@ static int vlan_device_event(struct notifier_block *unused, unsigned long event,
 	    (dev->features & NETIF_F_HW_VLAN_CTAG_FILTER)) {
 		pr_info("adding VLAN 0 to HW filter on device %s\n",
 			dev->name);
-		vlan_vid_add(dev, htons(ETH_P_8021Q), 0);
+		int err = vlan_vid_add(dev, htons(ETH_P_8021Q), 0);
+
+		if (err)
+			return notifier_from_errno(err);
 	}
 	if (event == NETDEV_DOWN &&
 	    (dev->features & NETIF_F_HW_VLAN_CTAG_FILTER))
-- 
2.25.1