diff options
author | Jason Wang <jasowang@redhat.com> | 2022-06-20 13:11:14 +0800 |
---|---|---|
committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2022-07-07 17:53:27 +0200 |
commit | 7cf7ed8f23c4e451a109b187fa12e071e98b9968 (patch) | |
tree | 49aa5eaeec7987a699790da07b292d4281fedb81 /drivers/net/caif/caif_virtio.c | |
parent | 4d5055873e24bba9e01b3b5d16790714b0d38533 (diff) |
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>
Diffstat (limited to 'drivers/net/caif/caif_virtio.c')
-rw-r--r-- | drivers/net/caif/caif_virtio.c | 10 |
1 files changed, 9 insertions, 1 deletions
diff --git a/drivers/net/caif/caif_virtio.c b/drivers/net/caif/caif_virtio.c index 91230894692d..da87de02b2fc 100644 --- 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; |