Commit c483ef73 authored Dec 06, 2019 by Stefano Garzarella Committed by Greg Kroah-Hartman Jan 04, 2020

vhost/vsock: accept only packets with the right dst_cid



[ 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>

parent 4840b6a7

drivers/vhost/vsock.c

+3 −1

Original line number	Diff line number	Diff line
		@@ -436,7 +436,9 @@ 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);