UPSTREAM: VSOCK: Don't dec ack backlog twice for rejected connections

If a pending socket is marked as rejected, we will decrease the
sk_ack_backlog twice. So don't decrement it for rejected sockets
in vsock_pending_work().

Testing of the rejected socket path was done through code
modifications.

BUG=chromium:763970
TEST=build caroline with USE=kvm_host

Reported-by: Stefan Hajnoczi <stefanha@redhat.com>
Signed-off-by: Jorgen Hansen <jhansen@vmware.com>
Reviewed-by: Adit Ranadive <aditr@vmware.com>
Reviewed-by: Aditya Sarwade <asarwade@vmware.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
(cherry picked from commit 1190cfdb1a19d89561ae51cff7d9c2ead24b3ebe)
Signed-off-by: Sonny Rao <sonnyrao@chromium.org>

Change-Id: Ife543376c1f334cc446ff80735642dd86bcad999
Reviewed-on: https://chromium-review.googlesource.com/1058935
Commit-Ready: Sonny Rao <sonnyrao@chromium.org>
Tested-by: Sonny Rao <sonnyrao@chromium.org>
Reviewed-by: Guenter Roeck <groeck@chromium.org>
1 file changed