diff --git a/net/ipv6/xfrm6_output.c b/net/ipv6/xfrm6_output.c
index 512bdaf13699..44b221a09a0c 100644
--- a/net/ipv6/xfrm6_output.c
+++ b/net/ipv6/xfrm6_output.c
@@ -19,7 +19,10 @@
 void xfrm6_local_rxpmtu(struct sk_buff *skb, u32 mtu)
 {
 	struct flowi6 fl6;
-	struct sock *sk = skb->sk;
+	struct sock *sk = skb_to_full_sk(skb);
+
+	if (!sk)
+		return;
 
 	fl6.flowi6_oif = sk->sk_bound_dev_if;
 	fl6.daddr = ipv6_hdr(skb)->daddr;
@@ -31,7 +34,10 @@ void xfrm6_local_error(struct sk_buff *skb, u32 mtu)
 {
 	struct flowi6 fl6;
 	const struct ipv6hdr *hdr;
-	struct sock *sk = skb->sk;
+	struct sock *sk = skb_to_full_sk(skb);
+
+	if (!sk)
+		return;
 
 	hdr = skb->encapsulation ? inner_ipv6_hdr(skb) : ipv6_hdr(skb);
 	fl6.fl6_dport = inet_sk(sk)->inet_dport;