systemd/0052-Allow-bad-MTU-values-with-warning-to-be-able-to-conn.patch

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From 557d5e9fecff500b010a9be44dda1ae000f45039 Mon Sep 17 00:00:00 2001
From: Matthias Greiner <magreiner@users.noreply.github.com>
Date: Mon, 22 May 2017 03:11:25 +0200
Subject: [PATCH] Allow bad MTU values with warning to be able to connect to
the machine. (#5954)
Ensure the MTU value is valid. Emit a warning and ignore otherwise.
(cherry picked from commit 955d99edc7991386a36e3d33924cc584931fde91)
---
src/libsystemd-network/sd-dhcp-lease.c | 5 +++++
1 file changed, 5 insertions(+)
diff --git a/src/libsystemd-network/sd-dhcp-lease.c b/src/libsystemd-network/sd-dhcp-lease.c
index 7fed55c5fc..565ec4cbe4 100644
--- a/src/libsystemd-network/sd-dhcp-lease.c
+++ b/src/libsystemd-network/sd-dhcp-lease.c
@@ -594,6 +594,11 @@ int dhcp_lease_parse_options(uint8_t code, uint8_t len, const void *option, void
r = lease_parse_u16(option, len, &lease->mtu, 68);
if (r < 0)
log_debug_errno(r, "Failed to parse MTU, ignoring: %m");
+ if (lease->mtu < DHCP_DEFAULT_MIN_SIZE) {
+ log_warning("MTU value of %d too small. Using default MTU value of %d instead.", lease->mtu, DHCP_DEFAULT_MIN_SIZE);
+ lease->mtu = DHCP_DEFAULT_MIN_SIZE;
+ }
+
break;
case SD_DHCP_OPTION_DOMAIN_NAME: