From 2d6fe53a7abdd412bd9e0fb5a2dde395ec656c25 Mon Sep 17 00:00:00 2001
From: Fernando ALVES <falves@alaloop.com>
Date: Sun, 17 Jan 2021 22:19:01 +0100
Subject: [PATCH] Fix infinite loop error 'Unknown AVP vendor'

---
 l2tpns.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/l2tpns.c b/l2tpns.c
index 6b8944c..e3b30fa 100644
--- a/l2tpns.c
+++ b/l2tpns.c
@@ -2701,7 +2701,7 @@ void processudp(uint8_t *buf, int len, struct sockaddr_in *addr, uint16_t indexu
 				uint8_t flags = *p;
 				uint16_t mtype;
 
-				if (n > l)
+				if ((n > l) || (n < 6))
 				{
 					LOG(1, s, t, "Invalid length in AVP\n");
 					STAT(tunnel_rx_errors);