From: Stefano Garzarella sgarzare@redhat.com
[ Upstream commit 8a3cc29c316c17de590e3ff8b59f3d6cbfd37b0a ]
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 --- drivers/vhost/vsock.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-)
--- a/drivers/vhost/vsock.c +++ b/drivers/vhost/vsock.c @@ -436,7 +436,9 @@ static void vhost_vsock_handle_tx_kick(s 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);