diff --git a/net/core/filter.c b/net/core/filter.c
index 89ed625e1474..0d1f93f944f2 100644
--- a/net/core/filter.c
+++ b/net/core/filter.c
@@ -6353,9 +6353,12 @@ BPF_CALL_5(bpf_skb_check_mtu, struct sk_buff *, skb,
 	 */
 	if (skb_is_gso(skb)) {
 		ret = BPF_MTU_CHK_RET_SUCCESS;
-		if (flags & BPF_MTU_CHK_SEGS &&
-		    !skb_gso_validate_network_len(skb, mtu))
-			ret = BPF_MTU_CHK_RET_SEGS_TOOBIG;
+		if (flags & BPF_MTU_CHK_SEGS) {
+			if (!skb_transport_header_was_set(skb))
+				return -EINVAL;
+			if (!skb_gso_validate_network_len(skb, mtu))
+				ret = BPF_MTU_CHK_RET_SEGS_TOOBIG;
+		}
 	}
 out:
 	*mtu_len = mtu;