From 2afae7e7c14ef14584abd9b0626e371fa96b5edb Mon Sep 17 00:00:00 2001
From: Martin Stein <martin.stein@genode-labs.com>
Date: Thu, 15 Jul 2021 12:57:36 +0200
Subject: [PATCH] nic_router: uncaught exc. on handling link state

An interface that received a signal for a link-state change accessed its
domain reference without assuming that it could not be attached to a domain
at that moment. This caused the NIC router to crash with an uncaught exception
of type 'Net::Pointer<Net::Domain>::Invalid'. The commit adds a catch
directive for this exception resulting in the handler doing nothing if not
attached to any domain.

Fixes #4222
---
 repos/os/src/server/nic_router/interface.cc | 1 +
 1 file changed, 1 insertion(+)

diff --git a/repos/os/src/server/nic_router/interface.cc b/repos/os/src/server/nic_router/interface.cc
index f9907b03ed..8a42059ed9 100644
--- a/repos/os/src/server/nic_router/interface.cc
+++ b/repos/os/src/server/nic_router/interface.cc
@@ -917,6 +917,7 @@ void Interface::handle_interface_link_state()
 			domain_.discard_ip_config();
 		}
 	}
+	catch (Pointer<Domain>::Invalid) { }
 	catch (Domain::Ip_config_static) { }
 	catch (Keep_ip_config) { }