linux-kernel - [PATCH net-next v4] net: openvswitch: Check vport netdev name

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Date: Thu, 18 Apr 2024 10:32:42 +0800
From: "jun.gu" <jun.gu@...ystack.cn>
To: echaudro@...hat.com
Cc: dev@...nvswitch.org,
	jun.gu@...ystack.cn,
	linux-kernel@...r.kernel.org,
	netdev@...r.kernel.org
Subject: [PATCH net-next v4] net: openvswitch: Check vport netdev name

Ensure that the provided netdev name is not one of its aliases to
prevent unnecessary creation and destruction of the vport by
ovs-vswitchd.

Signed-off-by: Jun Gu <jun.gu@...ystack.cn>
Acked-by: Eelco Chaudron <echaudro@...hat.com>
---
 net/openvswitch/vport-netdev.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/net/openvswitch/vport-netdev.c b/net/openvswitch/vport-netdev.c
index 903537a5da22..7003e76b8172 100644
--- a/net/openvswitch/vport-netdev.c
+++ b/net/openvswitch/vport-netdev.c
@@ -78,7 +78,10 @@ struct vport *ovs_netdev_link(struct vport *vport, const char *name)
 	int err;
 
 	vport->dev = dev_get_by_name(ovs_dp_get_net(vport->dp), name);
-	if (!vport->dev) {
+	/* Ensure that the device exists and that the provided
+	 * name is not one of its aliases.
+	 */
+	if ((!vport->dev) || strcmp(name, ovs_vport_name(vport))) {
 		err = -ENODEV;
 		goto error_free_vport;
 	}
-- 
2.25.1