CVE-2021-47024

In the Linux kernel, the following vulnerability has been resolved:
vsock/virtio: free queued packets when closing socket As reported by syzbot
[1], there is a memory leak while closing the socket. We partially solved
this issue with commit ac03046ece2b (“vsock/virtio: free packets during the
socket release”), but we forgot to drain the RX queue when the socket is
definitely closed by the scheduled work. To avoid future issues, let’s use
the new virtio_transport_remove_sock() to drain the RX queue before
removing the socket from the af_vsock lists calling vsock_remove_sock().
[1] https://syzkaller.appspot.com/bug?extid=24452624fc4c571eedd9