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-rw-r--r--src/devices/nm-device.c1
1 files changed, 1 insertions, 0 deletions
diff --git a/src/devices/nm-device.c b/src/devices/nm-device.c
index dde9af94..3d949ec2 100644
--- a/src/devices/nm-device.c
+++ b/src/devices/nm-device.c
@@ -5725,6 +5725,7 @@ rdisc_config_changed (NMRDisc *rdisc, NMRDiscConfigMap changed, NMDevice *self)
 			if (discovered_route->plen > 0) {
 				memset (&route, 0, sizeof (route));
 				route.network = discovered_route->network;
+				nm_assert (discovered_route->plen <= 128);
 				route.plen = discovered_route->plen;
 				route.gateway = discovered_route->gateway;
 				route.source = NM_IP_CONFIG_SOURCE_RDISC;