xfrm6_tunnel: exit_net cleanup check added

Be sure that spi_byaddr and spi_byspi arrays initialized in net_init hook
were return to initial state
Signed-off-by: NVasily Averin <vvs@virtuozzo.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

net/ipv6/xfrm6_tunnel.c

@@ -338,6 +338,14 @@ static int __net_init xfrm6_tunnel_net_init(struct net *net)
 
 static void __net_exit xfrm6_tunnel_net_exit(struct net *net)
 {
+	struct xfrm6_tunnel_net *xfrm6_tn = xfrm6_tunnel_pernet(net);
+	unsigned int i;
+
+	for (i = 0; i < XFRM6_TUNNEL_SPI_BYADDR_HSIZE; i++)
+		WARN_ON_ONCE(!hlist_empty(&xfrm6_tn->spi_byaddr[i]));
+
+	for (i = 0; i < XFRM6_TUNNEL_SPI_BYSPI_HSIZE; i++)
+		WARN_ON_ONCE(!hlist_empty(&xfrm6_tn->spi_byspi[i]));
 }
 
 static struct pernet_operations xfrm6_tunnel_net_ops = {