[PATCH 5.1 15/98] vsock/virtio: set SOCK_DONE on peer shutdown

[Greg Kroah-Hartman]

From: Stephen Barber <smbar...@chromium.org>

[ Upstream commit 42f5cda5eaf4396a939ae9bb43bb8d1d09c1b15c ]

Set the SOCK_DONE flag to match the TCP_CLOSING state when a peer has
shut down and there is nothing left to read.

This fixes the following bug:
1) Peer sends SHUTDOWN(RDWR).
2) Socket enters TCP_CLOSING but SOCK_DONE is not set.
3) read() returns -ENOTCONN until close() is called, then returns 0.

Signed-off-by: Stephen Barber <smbar...@chromium.org>
Signed-off-by: David S. Miller <da...@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gre...@linuxfoundation.org>
---
 net/vmw_vsock/virtio_transport_common.c |    4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

--- a/net/vmw_vsock/virtio_transport_common.c
+++ b/net/vmw_vsock/virtio_transport_common.c
@@ -871,8 +871,10 @@ virtio_transport_recv_connected(struct s
                if (le32_to_cpu(pkt->hdr.flags) & VIRTIO_VSOCK_SHUTDOWN_SEND)
                        vsk->peer_shutdown |= SEND_SHUTDOWN;
                if (vsk->peer_shutdown == SHUTDOWN_MASK &&
-                   vsock_stream_has_data(vsk) <= 0)
+                   vsock_stream_has_data(vsk) <= 0) {
+                       sock_set_flag(sk, SOCK_DONE);
                        sk->sk_state = TCP_CLOSING;
+               }
                if (le32_to_cpu(pkt->hdr.flags))
                        sk->sk_state_change(sk);
                break;