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vhost/vsock: accept only packets with the right dst_cid

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[ Upstream commit 8a3cc29c31 ]

When we receive a new packet from the guest, we check if the
src_cid is correct, but we forgot to check the dst_cid.

The host should accept only packets where dst_cid is
equal to the host CID.

Signed-off-by: Stefano Garzarella <sgarzare@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Stefano Garzarella 2019-12-06 15:39:12 +01:00 committed by Greg Kroah-Hartman
parent 252ac779a4
commit bb9aab7844
1 changed files with 3 additions and 1 deletions
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4
drivers/vhost/vsock.c
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@ -437,7 +437,9 @@ static void vhost_vsock_handle_tx_kick(struct vhost_work *work)
virtio_transport_deliver_tap_pkt(pkt);
/* Only accept correctly addressed packets */
if (le64_to_cpu(pkt->hdr.src_cid) == vsock->guest_cid)
if (le64_to_cpu(pkt->hdr.src_cid) == vsock->guest_cid &&
le64_to_cpu(pkt->hdr.dst_cid) ==
vhost_transport_get_local_cid())
virtio_transport_recv_pkt(pkt);
else
virtio_transport_free_pkt(pkt);