
static int xdp_do_generic_redirect_map(struct net_device *dev,
				       struct sk_buff *skb,
				       struct xdp_buff *xdp,
				       struct bpf_prog *xdp_prog,
				       void *fwd,
				       enum bpf_map_type map_type, u32 map_id)
{
	struct bpf_redirect_info *ri = this_cpu_ptr(&bpf_redirect_info);
	struct bpf_map *map;
	int err = 0;

+	if (!xdp_prog) {
+		err = -EINVAL;
+		goto out;
+	}

	// ... rest of the function

+out:
+	return err;
