caif_virtio: fix race between virtio_device_ready() and ndo_open()

commit 11a37eb66812ce6a06b79223ad530eb0e1d7294d upstream.

We currently depend on probe() calling virtio_device_ready() -
which happens 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 (e.g. TX) 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: 0d2e1a2926b18 ("caif_virtio: Introduce caif over virtio")
Signed-off-by: Jason Wang <jasowang@redhat.com>
Message-Id: <20220620051115.3142-3-jasowang@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/net/caif/caif_virtio.c b/drivers/net/caif/caif_virtio.c
index 9123089..da87de0 100644 (file)
--- a/drivers/net/caif/caif_virtio.c
+++ b/drivers/net/caif/caif_virtio.c
@@ -721,13 +721,21 @@ static int cfv_probe(struct virtio_device *vdev)
        /* Carrier is off until netdevice is opened */
        netif_carrier_off(netdev);
 
+       /* serialize netdev register + virtio_device_ready() with ndo_open() */
+       rtnl_lock();
+
        /* register Netdev */
-       err = register_netdev(netdev);
+       err = register_netdevice(netdev);
        if (err) {
+               rtnl_unlock();
                dev_err(&vdev->dev, "Unable to register netdev (%d)\n", err);
                goto err;
        }
 
+       virtio_device_ready(vdev);
+
+       rtnl_unlock();
+
        debugfs_init(cfv);
 
        return 0;