diff options
authorJason Wang <>2022-06-17 15:29:49 +0800
committerMichael S. Tsirkin <>2022-06-27 08:02:59 -0400
commit50c0ada627f56c92f5953a8bf9158b045ad026a1 (patch)
parentc346dae4f3fbce51bbd4f2ec5e8c6f9b91e93163 (diff)
virtio-net: fix race between ndo_open() and virtio_device_ready()
We currently call virtio_device_ready() after netdev registration. Since ndo_open() can be called immediately after register_netdev, this means there exists a race between ndo_open() and virtio_device_ready(): the driver may start to use the device before DRIVER_OK which violates the spec. Fix this by switching to use register_netdevice() and protect the virtio_device_ready() with rtnl_lock() to make sure ndo_open() can only be called after virtio_device_ready(). Fixes: 4baf1e33d0842 ("virtio_net: enable VQs early") Signed-off-by: Jason Wang <> Message-Id: <> Signed-off-by: Michael S. Tsirkin <>
1 files changed, 7 insertions, 1 deletions
diff --git a/drivers/net/virtio_net.c b/drivers/net/virtio_net.c
index db05b5e930be..8a5810bcb839 100644
--- a/drivers/net/virtio_net.c
+++ b/drivers/net/virtio_net.c
@@ -3655,14 +3655,20 @@ static int virtnet_probe(struct virtio_device *vdev)
if (vi->has_rss || vi->has_rss_hash_report)
- err = register_netdev(dev);
+ /* serialize netdev register + virtio_device_ready() with ndo_open() */
+ rtnl_lock();
+ err = register_netdevice(dev);
if (err) {
pr_debug("virtio_net: registering device failed\n");
+ rtnl_unlock();
goto free_failover;
+ rtnl_unlock();
err = virtnet_cpu_notif_add(vi);
if (err) {
pr_debug("virtio_net: registering cpu notifier failed\n");