[PATCH v3] vsock/virtio: initialize the_virtio_vsock before using VQs

[Alexandru Matei <alexandru.matei@xxxxxxxxxx>]

Once VQs are filled with empty buffers and we kick the host, it can send
connection requests. If the_virtio_vsock is not initialized before,
replies are silently dropped and do not reach the host.

virtio_transport_send_pkt() can queue packets once the_virtio_vsock is
set, but they won't be processed until vsock->tx_run is set to true. We
queue vsock->send_pkt_work when initialization finishes to send those
packets queued earlier.

Fixes: 0deab087b16a ("vsock/virtio: use RCU to avoid use-after-free on the_virtio_vsock")
Signed-off-by: Alexandru Matei <alexandru.matei@xxxxxxxxxx>
---
v3:
- renamed vqs_fill to vqs_start and moved tx_run initialization to it
- queued send_pkt_work at the end of initialization to send packets queued earlier
v2: 
- split virtio_vsock_vqs_init in vqs_init and vqs_fill and moved 
  the_virtio_vsock initialization after vqs_init

 net/vmw_vsock/virtio_transport.c | 13 +++++++++++--
 1 file changed, 11 insertions(+), 2 deletions(-)

diff --git a/net/vmw_vsock/virtio_transport.c b/net/vmw_vsock/virtio_transport.c
index e95df847176b..c0333f9a8002 100644
--- a/net/vmw_vsock/virtio_transport.c
+++ b/net/vmw_vsock/virtio_transport.c
@@ -555,6 +555,11 @@ static int virtio_vsock_vqs_init(struct virtio_vsock *vsock)
 
 	virtio_device_ready(vdev);
 
+	return 0;
+}
+
+static void virtio_vsock_vqs_start(struct virtio_vsock *vsock)
+{
 	mutex_lock(&vsock->tx_lock);
 	vsock->tx_run = true;
 	mutex_unlock(&vsock->tx_lock);
@@ -568,8 +573,6 @@ static int virtio_vsock_vqs_init(struct virtio_vsock *vsock)
 	virtio_vsock_event_fill(vsock);
 	vsock->event_run = true;
 	mutex_unlock(&vsock->event_lock);
-
-	return 0;
 }
 
 static void virtio_vsock_vqs_del(struct virtio_vsock *vsock)
@@ -664,6 +667,9 @@ static int virtio_vsock_probe(struct virtio_device *vdev)
 		goto out;
 
 	rcu_assign_pointer(the_virtio_vsock, vsock);
+	virtio_vsock_vqs_start(vsock);
+
+	queue_work(virtio_vsock_workqueue, &vsock->send_pkt_work);
 
 	mutex_unlock(&the_virtio_vsock_mutex);
 
@@ -736,6 +742,9 @@ static int virtio_vsock_restore(struct virtio_device *vdev)
 		goto out;
 
 	rcu_assign_pointer(the_virtio_vsock, vsock);
+	virtio_vsock_vqs_start(vsock);
+
+	queue_work(virtio_vsock_workqueue, &vsock->send_pkt_work);
 
 out:
 	mutex_unlock(&the_virtio_vsock_mutex);
-- 
2.25.1