[NETNS]: Add netns refcnt debug into fib_info.

Signed-off-by: Denis V. Lunev <den@openvz.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/net/ipv4/fib_semantics.c b/net/ipv4/fib_semantics.c
index a13c847..3b83c34 100644
--- a/net/ipv4/fib_semantics.c
+++ b/net/ipv4/fib_semantics.c
@@ -152,6 +152,7 @@
 		nh->nh_dev = NULL;
 	} endfor_nexthops(fi);
 	fib_info_cnt--;
+	release_net(fi->fib_net);
 	kfree(fi);
 }
 
@@ -730,7 +731,7 @@
 		goto failure;
 	fib_info_cnt++;
 
-	fi->fib_net = net;
+	fi->fib_net = hold_net(net);
 	fi->fib_protocol = cfg->fc_protocol;
 	fi->fib_flags = cfg->fc_flags;
 	fi->fib_priority = cfg->fc_priority;