net: net_assign_generic() fix

memcpy() should take into account size of pointers,
not only number of pointers to copy.
Signed-off-by: NEric Dumazet <eric.dumazet@gmail.com>
Acked-by: NPavel Emelyanov <xemul@openvz.org>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

net/core/net_namespace.c

@@ -488,7 +488,7 @@ int net_assign_generic(struct net *net, int id, void *data)
 	 */
 
 	ng->len = id;
-	memcpy(&ng->ptr, &old_ng->ptr, old_ng->len);
+	memcpy(&ng->ptr, &old_ng->ptr, old_ng->len * sizeof(void*));
 
 	rcu_assign_pointer(net->gen, ng);
 	call_rcu(&old_ng->rcu, net_generic_release);