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virtio/vsock: WARN_ONCE() for invalid state of socket

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This adds WARN_ONCE() and return from stream dequeue callback when
socket's queue is empty, but 'rx_bytes' still non-zero. This allows
the detection of potential bugs due to packet merging (see previous
patch).

Signed-off-by: Arseniy Krasnov <AVKrasnov@sberdevices.ru>
Reviewed-by: Stefano Garzarella <sgarzare@redhat.com>
Signed-off-by: Paolo Abeni <pabeni@redhat.com>
This commit is contained in:
Arseniy Krasnov 2023-03-28 14:32:12 +03:00 • committed by Paolo Abeni
parent f7154d967b
commit b8d2f61fdf
1 changed files with 7 additions and 0 deletions
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7
net/vmw_vsock/virtio_transport_common.c
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@ -363,6 +363,13 @@ virtio_transport_stream_do_dequeue(struct vsock_sock *vsk,
u32 free_space;
spin_lock_bh(&vvs->rx_lock);
if (WARN_ONCE(skb_queue_empty(&vvs->rx_queue) && vvs->rx_bytes,
"rx_queue is empty, but rx_bytes is non-zero\n")) {
spin_unlock_bh(&vvs->rx_lock);
return err;
}
while (total < len && !skb_queue_empty(&vvs->rx_queue)) {
skb = skb_peek(&vvs->rx_queue);