From 6e101adc28c9c682f023386831d632a477768cb8 Mon Sep 17 00:00:00 2001
From: Gunnar Beutner <gbeutner@serenityos.org>
Date: Thu, 6 May 2021 08:37:46 +0200
Subject: [PATCH] DHCPClient: Handle invalid DHCP responses more gracefully

---
 Userland/Services/DHCPClient/DHCPv4Client.cpp | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/Userland/Services/DHCPClient/DHCPv4Client.cpp b/Userland/Services/DHCPClient/DHCPv4Client.cpp
index 426cec15c1..a75538372f 100644
--- a/Userland/Services/DHCPClient/DHCPv4Client.cpp
+++ b/Userland/Services/DHCPClient/DHCPv4Client.cpp
@@ -287,7 +287,11 @@ void DHCPv4Client::process_incoming(const DHCPv4Packet& packet)
 
     dbgln_if(DHCPV4CLIENT_DEBUG, "Here are the options: {}", options.to_string());
 
-    auto value = options.get<DHCPMessageType>(DHCPOption::DHCPMessageType).value();
+    auto value_or_error = options.get<DHCPMessageType>(DHCPOption::DHCPMessageType);
+    if (!value_or_error.has_value())
+        return;
+
+    auto value = value_or_error.value();
     switch (value) {
     case DHCPMessageType::DHCPOffer:
         handle_offer(packet, options);