[RFC PATCH v1 2/3] virtio/vsock: add WARN() for invalid state of socket

[Arseniy Krasnov <avkrasnov@xxxxxxxxxxxxxx>]

This prints WARN() and returns from stream dequeue callback when socket's
queue is empty, but 'rx_bytes' still non-zero.

Signed-off-by: Arseniy Krasnov <AVKrasnov@xxxxxxxxxxxxxx>
---
 net/vmw_vsock/virtio_transport_common.c | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/net/vmw_vsock/virtio_transport_common.c b/net/vmw_vsock/virtio_transport_common.c
index 3c75986e16c2..c35b03adad8d 100644
--- a/net/vmw_vsock/virtio_transport_common.c
+++ b/net/vmw_vsock/virtio_transport_common.c
@@ -388,6 +388,13 @@ virtio_transport_stream_do_dequeue(struct vsock_sock *vsk,
 	u32 free_space;
 
 	spin_lock_bh(&vvs->rx_lock);
+
+	if (skb_queue_empty(&vvs->rx_queue) && vvs->rx_bytes) {
+		WARN(1, "No skbuffs with non-zero 'rx_bytes'\n");
+		spin_unlock_bh(&vvs->rx_lock);
+		return err;
+	}
+
 	while (total < len && !skb_queue_empty(&vvs->rx_queue)) {
 		skb = skb_peek(&vvs->rx_queue);
 
-- 
2.25.1