netdev - [PATCH net] net: vlan: sync VLAN features with lower device

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite for Android: free password hash cracker in your pocket

[<prev] [next>] [day] [month] [year] [list]

Message-ID: <20251021095658.86478-1-liuhangbin@gmail.com>
Date: Tue, 21 Oct 2025 09:56:53 +0000
From: Hangbin Liu <liuhangbin@...il.com>
To: netdev@...r.kernel.org
Cc: "David S. Miller" <davem@...emloft.net>,
	Eric Dumazet <edumazet@...gle.com>,
	Jakub Kicinski <kuba@...nel.org>,
	Paolo Abeni <pabeni@...hat.com>,
	Simon Horman <horms@...nel.org>,
	Stanislav Fomichev <sdf@...ichev.me>,
	"Dr. David Alan Gilbert" <linux@...blig.org>,
	Dong Chenchen <dongchenchen2@...wei.com>,
	Oscar Maes <oscmaes92@...il.com>,
	Hangbin Liu <liuhangbin@...il.com>
Subject: [PATCH net] net: vlan: sync VLAN features with lower device

After registering a VLAN device and setting its feature flags, we need to
synchronize the VLAN features with the lower device. For example, the VLAN
device does not have the NETIF_F_LRO flag, it should be synchronized with
the lower device based on the NETIF_F_UPPER_DISABLES definition.

As the dev->vlan_features has changed, we need to call
netdev_change_features(). The caller must run after netdev_upper_dev_link()
links the lower devices, so this patch adds the netdev_change_features()
call in register_vlan_dev().

Signed-off-by: Hangbin Liu <liuhangbin@...il.com>
---

I’m not sure what the proper Fixes tag should be, so I’ve left it blank for
now. If anyone has a clue, please let me know.

---
 net/8021q/vlan.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/net/8021q/vlan.c b/net/8021q/vlan.c
index fda3a80e9340..4857fb0ee11d 100644
--- a/net/8021q/vlan.c
+++ b/net/8021q/vlan.c
@@ -193,6 +193,8 @@ int register_vlan_dev(struct net_device *dev, struct netlink_ext_ack *extack)
 	vlan_group_set_device(grp, vlan->vlan_proto, vlan_id, dev);
 	grp->nr_vlan_devs++;

+	netdev_change_features(dev);
+
 	return 0;

 out_unregister_netdev:
-- 
2.50.1