From b234ee7859de556c272c36fc691cee4cb08f7230 Mon Sep 17 00:00:00 2001 From: Yu Watanabe Date: Thu, 20 May 2021 16:14:17 +0900 Subject: [PATCH] network: fix an infinite loop Fixes #19467. (cherry picked from commit e8f99f4e249916e12c09ee5cc9a108cba6a2b5c0) Reference: https://github.com/systemd/systemd-stable/commit/b234ee7859de556c272c36fc691cee4cb08f7230 Conflict: adapt context --- src/network/networkd-link.c | 6 ++++++ 1 file changed, 6 insertions(+) diff --git a/src/network/networkd-link.c b/src/network/networkd-link.c index 8219d95b0d..c781dd58d7 100644 --- a/src/network/networkd-link.c +++ b/src/network/networkd-link.c @@ -157,6 +157,12 @@ static void link_update_master_operstate(Link *link, NetDev *netdev) { if (!netdev) return; + /* If an interface is self-mentioned in Bridge= or friends, then it introduces an infinite loop. + * FIXME: there still exits a possibility of an infinite loop when two or more interfaces + * mention each other in Bridge= or so. We need to detect such a loop. */ + if (link->ifindex == netdev->ifindex) + return; + if (link_get(link->manager, netdev->ifindex, &master) < 0) return; -- 2.27.0