[PATCH 1/1] virtio-vsock: Fix unbound rx buffer

[ggarcia]

From: Gerard Garcia <ggar...@deic.uab.cat>

Reset connection and close rx socket when the sender is ignoring our announced 
available buffer.

Signed-off-by: Gerard Garcia <ggar...@deic.uab.cat>
---
 net/vmw_vsock/virtio_transport_common.c | 22 ++++++++++++++++------
 1 file changed, 16 insertions(+), 6 deletions(-)

diff --git a/net/vmw_vsock/virtio_transport_common.c 
b/net/vmw_vsock/virtio_transport_common.c
index a53b3a1..3c38d43 100644
--- a/net/vmw_vsock/virtio_transport_common.c
+++ b/net/vmw_vsock/virtio_transport_common.c
@@ -773,13 +773,23 @@ virtio_transport_recv_connected(struct sock *sk,
                pkt->len = le32_to_cpu(pkt->hdr.len);
                pkt->off = 0;
 
-               spin_lock_bh(&vvs->rx_lock);
-               virtio_transport_inc_rx_pkt(vvs, pkt);
-               list_add_tail(&pkt->list, &vvs->rx_queue);
-               spin_unlock_bh(&vvs->rx_lock);
+               if (vvs->rx_bytes + pkt->len <= vvs->buf_size) {
+                       spin_lock_bh(&vvs->rx_lock);
+                       virtio_transport_inc_rx_pkt(vvs, pkt);
+                       list_add_tail(&pkt->list, &vvs->rx_queue);
+                       spin_unlock_bh(&vvs->rx_lock);
+
+                       sk->sk_data_ready(sk);
+                       return err;
+               } else {
+                       /* Sender is ignoring our buf_alloc */
+                       spin_unlock_bh(&vvs->rx_lock);
+
+                       virtio_transport_reset(vsk, pkt);
+                       virtio_transport_do_close(vsk, true);
+                       break;
+               }
 
-               sk->sk_data_ready(sk);
-               return err;
        case VIRTIO_VSOCK_OP_CREDIT_UPDATE:
                sk->sk_write_space(sk);
                break;
-- 
2.9.1