modules/admin-{mini,full}: prevent crash in iface overview page if ifconfig does not return information

1 files changed, 12 insertions, 3 deletions

diff --git a/modules/admin-full/luasrc/model/cbi/admin_network/network.lua b/modules/admin-full/luasrc/model/cbi/admin_network/network.lua
index 8d34fa7cff..2dc9e9b43a 100644
--- a/modules/admin-full/luasrc/model/cbi/admin_network/network.lua
+++ b/modules/admin-full/luasrc/model/cbi/admin_network/network.lua
@@ -86,9 +86,18 @@ end
 hwaddr = s:option(DummyValue, "_hwaddr")
 function hwaddr.cfgvalue(self, section)
 	local ix = self.map:get(section, "ifname") or ""
-	return fs.readfile("/sys/class/net/" .. ix .. "/address")
-	 or luci.util.exec("ifconfig " .. ix):match(" ([A-F0-9:]+)%s*\n")
-	 or "n/a"
+	local mac = fs.readfile("/sys/class/net/" .. ix .. "/address")
+
+	if not mac then
+		mac = luci.util.exec("ifconfig " .. ix)
+		mac = mac and mac:match(" ([A-F0-9:]+)%s*\n")
+	end
+
+	if mac and #mac > 0 then
+		return mac:upper()
+	end
+
+	return "?"
 end