diff --git a/net/l2tp/l2tp_core.c b/net/l2tp/l2tp_core.c
index 687c1366a4d0f..70335667ef037 100644
--- a/net/l2tp/l2tp_core.c
+++ b/net/l2tp/l2tp_core.c
@@ -1086,8 +1086,10 @@ int l2tp_udp_encap_recv(struct sock *sk, struct sk_buff *skb)
 	tunnel = session->tunnel;
 
 	/* Check protocol version */
-	if (version != tunnel->version)
+	if (version != tunnel->version) {
+		l2tp_session_put(session);
 		goto invalid;
+	}
 
 	if (version == L2TP_HDR_VER_3 &&
 	    l2tp_v3_ensure_opt_in_linear(session, skb, &ptr, &optr)) {