diff --git a/net/l2tp/l2tp_core.c b/net/l2tp/l2tp_core.c
index 425b95eb7e87..6dc3bfa12b1e 100644
--- a/net/l2tp/l2tp_core.c
+++ b/net/l2tp/l2tp_core.c
@@ -1460,6 +1460,9 @@ static int l2tp_validate_socket(const struct sock *sk, const struct net *net,
 	if (sk->sk_type != SOCK_DGRAM)
 		return -EPROTONOSUPPORT;
 
+	if (sk->sk_family != PF_INET && sk->sk_family != PF_INET6)
+		return -EPROTONOSUPPORT;
+
 	if ((encap == L2TP_ENCAPTYPE_UDP && sk->sk_protocol != IPPROTO_UDP) ||
 	    (encap == L2TP_ENCAPTYPE_IP && sk->sk_protocol != IPPROTO_L2TP))
 		return -EPROTONOSUPPORT;