macvtap: Don't leak unreceived packets when we delete a macvtap device.

To avoid leaking packets in the receive queue.  Add a socket destructor
that will run whenever destroy a macvtap socket.

Signed-off-by: Eric W. Biederman <ebiederm@xmission.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 6 insertions, 0 deletions

diff --git a/drivers/net/macvtap.c b/drivers/net/macvtap.c
index 1d9c9c209672..515aa873929e 100644
--- a/drivers/net/macvtap.c
+++ b/drivers/net/macvtap.c
@@ -339,6 +339,11 @@ static void macvtap_sock_write_space(struct sock *sk)
                 wake_up_interruptible_poll(wqueue, POLLOUT | POLLWRNORM | POLLWRBAND);
 }
 
+static void macvtap_sock_destruct(struct sock *sk)
+{
+        skb_queue_purge(&sk->sk_receive_queue);
+}
+
 static int macvtap_open(struct inode *inode, struct file *file)
 {
         struct net *net = current->nsproxy->net_ns;
@@ -369,6 +374,7 @@ static int macvtap_open(struct inode *inode, struct file *file)
         q->sock.ops = &macvtap_socket_ops;
         sock_init_data(&q->sock, &q->sk);
         q->sk.sk_write_space = macvtap_sock_write_space;
+        q->sk.sk_destruct = macvtap_sock_destruct;
         q->flags = IFF_VNET_HDR | IFF_NO_PI | IFF_TAP;
         q->vnet_hdr_sz = sizeof(struct virtio_net_hdr);