network: address-pool: also check conflicts with foreign addresses

Fixes CI issue found in
https://github.com/systemd/systemd-centos-ci/pull/334.

hwdb.d/60-evdev.hwdb

@@ -559,6 +559,15 @@ evdev:name:MSFT0001:02 04F3:304B Touchpad:dmi:*svnLENOVO:*pvrLenovoLegionY9000X2
  EVDEV_ABS_35=::31
  EVDEV_ABS_36=::30
 
+#########################################
+# NEWYES
+#########################################
+
+# NEWYES 10" LCD writing tablet
+evdev:input:b0003v6161p4D15*
+ EVDEV_ABS_00=::152
+ EVDEV_ABS_01=::244
+
 #########################################
 # Razer
 #########################################

src/network/networkd-address-pool.c

@@ -107,6 +107,15 @@ static bool address_pool_prefix_is_taken(
                                 return true;
                 }
 
+                /* Don't clash with assigned foreign addresses */
+                SET_FOREACH(a, l->addresses_foreign) {
+                        if (a->family != p->family)
+                                continue;
+
+                        if (in_addr_prefix_intersect(p->family, u, prefixlen, &a->in_addr, a->prefixlen))
+                                return true;
+                }
+
                 /* Don't clash with addresses already pulled from the pool, but not assigned yet */
                 SET_FOREACH(a, l->pool_addresses) {
                         if (a->family != p->family)