From: Guus Sliepen <guus@tinc-vpn.org>
Date: Sat, 23 Jun 2018 20:26:12 +0000 (+0200)
Subject: Avoid treating compressed MTU probes as having a negative length.
X-Git-Tag: release-1.1pre17~13
X-Git-Url: https://www.tinc-vpn.org/git/browse?p=tinc;a=commitdiff_plain;h=e5b9bd324cc24355956e9e59e5ec2df72cf9d469

Avoid treating compressed MTU probes as having a negative length.

This was not harmful, but caused negative values being logged.
---

diff --git a/src/net_packet.c b/src/net_packet.c
index ebf2938a..9baaf4c8 100644
--- a/src/net_packet.c
+++ b/src/net_packet.c
@@ -462,7 +462,10 @@ static bool receive_udppacket(node_t *n, vpn_packet_t *inpkt) {
 
 		inpkt = outpkt;
 
-		origlen -= MTU / 64 + 20;
+		if (origlen > MTU / 64 + 20)
+			origlen -= MTU / 64 + 20;
+		else
+			origlen = 0;
 	}
 
 	if(inpkt->len > n->maxrecentlen) {