From: Stefano Garzarella <sgarzare@redhat.com>
Date: Fri, 6 Dec 2019 15:39:12 +0100
Subject: vhost/vsock: accept only packets with the right dst_cid
Git-commit: 8a3cc29c316c17de590e3ff8b59f3d6cbfd37b0a
Patch-mainline: 5.5-rc1
References: networking-stable-20_01_01

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: Jiri Slaby <jslaby@suse.cz>
---
 drivers/vhost/vsock.c |    4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

--- a/drivers/vhost/vsock.c
+++ b/drivers/vhost/vsock.c
@@ -396,7 +396,9 @@ 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);