From c5bc3091ccb62748a243e31b836903cedee9711d Mon Sep 17 00:00:00 2001
From: Charles Kerr <charles@charleskerr.com>
Date: Sun, 23 Jan 2022 11:31:20 -0600
Subject: [PATCH] fixup! NAT-PMP private/public port and lifetime fix (#1602)
 (#2482)

ensure the value passed to tr_timerAdd() is non-negative
---
 libtransmission/port-forwarding.cc | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/libtransmission/port-forwarding.cc b/libtransmission/port-forwarding.cc
index dd42b3386..0bd71146a 100644
--- a/libtransmission/port-forwarding.cc
+++ b/libtransmission/port-forwarding.cc
@@ -129,7 +129,7 @@ static void set_evtimer_from_status(tr_shared* s)
         /* if we're mapped, everything is fine... check back at renew_time
          * to renew the port forwarding if it's expired */
         s->doPortCheck = true;
-        sec = int(s->natpmp->renew_time - tr_time());
+        sec = std::max(0, int(s->natpmp->renew_time - tr_time()));
         break;
 
     case TR_PORT_ERROR: