Everywhere: Make ByteBuffer::{create_*,copy}() OOM-safe

Author: https://github.com/alimpfard
Commit: 97e97bccab
Pull-request: https://github.com/SerenityOS/serenity/pull/9832
Reviewed-by: https://github.com/IdanHo

Kernel/Net/NetworkAdapter.cpp

@@ -33,8 +33,12 @@ void NetworkAdapter::send_packet(ReadonlyBytes packet)
 void NetworkAdapter::send(const MACAddress& destination, const ARPPacket& packet)
 {
     size_t size_in_bytes = sizeof(EthernetFrameHeader) + sizeof(ARPPacket);
-    auto buffer = NetworkByteBuffer::create_zeroed(size_in_bytes);
-    auto* eth = (EthernetFrameHeader*)buffer.data();
+    auto buffer_result = NetworkByteBuffer::create_zeroed(size_in_bytes);
+    if (!buffer_result.has_value()) {
+        dbgln("Dropping ARP packet targeted at {} as there is not enough memory to buffer it", packet.target_hardware_address().to_string());
+        return;
+    }
+    auto* eth = (EthernetFrameHeader*)buffer_result->data();
     eth->set_source(mac_address());
     eth->set_destination(destination);
     eth->set_ether_type(EtherType::ARP);