From a7b05b77ca1a68046b52cac08b4f2fe7c53e2a5d Mon Sep 17 00:00:00 2001 From: Stefano Garzarella Date: Fri, 6 Dec 2019 15:39:12 +0100 Subject: [PATCH] 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 Signed-off-by: David S. Miller Signed-off-by: Greg Kroah-Hartman --- drivers/vhost/vsock.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-) diff --git a/drivers/vhost/vsock.c b/drivers/vhost/vsock.c index a775493b7b67..2e37097916b5 100644 --- a/drivers/vhost/vsock.c +++ b/drivers/vhost/vsock.c @@ -399,7 +399,9 @@ static void vhost_vsock_handle_tx_kick(struct vhost_work *work) len = pkt->len; /* 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);