systemd/0059-DHCP-Fail-link_dhcp_set_routes-promotely-if-no-addre.patch

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From 57497d1f0367e4418c7c5e419ba0f911ad840ce9 Mon Sep 17 00:00:00 2001
From: Daniel Wang <wonderfly@users.noreply.github.com>
Date: Wed, 24 May 2017 05:05:49 -0700
Subject: [PATCH] DHCP: Fail link_dhcp_set_routes promotely if no address is
assigned from lease (#6009)
Currently the local variable `address` is unintialized if the DHCP lease
doesn't provide a router address (when r == -ENODATA). Thus the
subsequent call to route_scope_from_address will result in accessing an
unintialized variable.
As a matter of fact, sd-dhcp-client ignores DHCP leases without an
address so link_dhcp_set_routes probably will never be called without a
valid address.
(cherry picked from commit b23aec0d6b98bc99998786506a8769e1a1ea1841)
---
src/network/networkd-dhcp4.c | 8 ++++----
1 file changed, 4 insertions(+), 4 deletions(-)
diff --git a/src/network/networkd-dhcp4.c b/src/network/networkd-dhcp4.c
index ae0f78daab..9229b5753c 100644
--- a/src/network/networkd-dhcp4.c
+++ b/src/network/networkd-dhcp4.c
@@ -77,6 +77,10 @@ static int link_set_dhcp_routes(Link *link) {
if (!link->network->dhcp_use_routes)
return 0;
+ r = sd_dhcp_lease_get_address(link->dhcp_lease, &address);
+ if (r < 0)
+ return log_link_warning_errno(link, r, "DHCP error: could not get address: %m");
+
r = sd_dhcp_lease_get_router(link->dhcp_lease, &gateway);
if (r < 0 && r != -ENODATA)
return log_link_warning_errno(link, r, "DHCP error: could not get gateway: %m");
@@ -85,10 +89,6 @@ static int link_set_dhcp_routes(Link *link) {
_cleanup_route_free_ Route *route = NULL;
_cleanup_route_free_ Route *route_gw = NULL;
- r = sd_dhcp_lease_get_address(link->dhcp_lease, &address);
- if (r < 0)
- return log_link_warning_errno(link, r, "DHCP error: could not get address: %m");
-
r = route_new(&route);
if (r < 0)
return log_link_error_errno(link, r, "Could not allocate route: %m");