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vsock/virtio: fix packet delivery to tap device

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commit b32a09ea7c upstream.

Commit 82dfb540ae ("VSOCK: Add virtio vsock vsockmon hooks") added
virtio_transport_deliver_tap_pkt() for handing packets to the
vsockmon device. However, in virtio_transport_send_pkt_work(),
the function is called before actually sending the packet (i.e.
before placing it in the virtqueue with virtqueue_add_sgs() and checking
whether it returned successfully).
Queuing the packet in the virtqueue can fail even multiple times.
However, in virtio_transport_deliver_tap_pkt() we deliver the packet
to the monitoring tap interface only the first time we call it.
This certainly avoids seeing the same packet replicated multiple times
in the monitoring interface, but it can show the packet sent with the
wrong timestamp or even before we succeed to queue it in the virtqueue.

Move virtio_transport_deliver_tap_pkt() after calling virtqueue_add_sgs()
and making sure it returned successfully.

Fixes: 82dfb540ae ("VSOCK: Add virtio vsock vsockmon hooks")
Cc: stable@vge.kernel.org
Signed-off-by: Marco Pinna <marco.pinn95@gmail.com>
Reviewed-by: Stefano Garzarella <sgarzare@redhat.com>
Link: https://lore.kernel.org/r/20240329161259.411751-1-marco.pinn95@gmail.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Marco Pinna
2024-03-29 17:12:59 +01:00
committed by Greg Kroah-Hartman
parent fc77240f63
commit db388b8e12
1 changed files with 2 additions and 1 deletions
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3
net/vmw_vsock/virtio_transport.c
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@@ -109,7 +109,6 @@ virtio_transport_send_pkt_work(struct work_struct *work)
if (!skb)
break;
virtio_transport_deliver_tap_pkt(skb);
reply = virtio_vsock_skb_reply(skb);
sg_init_one(&hdr, virtio_vsock_hdr(skb), sizeof(*virtio_vsock_hdr(skb)));
@@ -128,6 +127,8 @@ virtio_transport_send_pkt_work(struct work_struct *work)
break;
}
virtio_transport_deliver_tap_pkt(skb);
if (reply) {
struct virtqueue *rx_vq = vsock->vqs[VSOCK_VQ_RX];
int val;