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vhost/vsock: fix incorrect used length reported to the guest
commit49d8c5ffad
upstream. The "used length" reported by calling vhost_add_used() must be the number of bytes written by the device (using "in" buffers). In vhost_vsock_handle_tx_kick() the device only reads the guest buffers (they are all "out" buffers), without writing anything, so we must pass 0 as "used length" to comply virtio spec. Fixes:433fc58e6b
("VSOCK: Introduce vhost_vsock.ko") Cc: stable@vger.kernel.org Reported-by: Halil Pasic <pasic@linux.ibm.com> Suggested-by: Jason Wang <jasowang@redhat.com> Signed-off-by: Stefano Garzarella <sgarzare@redhat.com> Link: https://lore.kernel.org/r/20211122163525.294024-2-sgarzare@redhat.com Signed-off-by: Michael S. Tsirkin <mst@redhat.com> Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com> Reviewed-by: Halil Pasic <pasic@linux.ibm.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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@ -491,7 +491,7 @@ static void vhost_vsock_handle_tx_kick(struct vhost_work *work)
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virtio_transport_free_pkt(pkt);
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len += sizeof(pkt->hdr);
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vhost_add_used(vq, head, len);
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vhost_add_used(vq, head, 0);
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total_len += len;
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added = true;
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} while(likely(!vhost_exceeds_weight(vq, ++pkts, total_len)));
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