From ad22cfd741daf20f6fa549f8c2fc20b145e25499 Mon Sep 17 00:00:00 2001
From: Avery Black <avery.c.black@gmail.com>
Date: Sat, 12 Oct 2024 09:10:30 -0700
Subject: [PATCH] Prevent duplicate address nubs

---
 VoodooSMBus/VoodooSMBusControllerDriver.cpp | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/VoodooSMBus/VoodooSMBusControllerDriver.cpp b/VoodooSMBus/VoodooSMBusControllerDriver.cpp
index 1d6a7b5..2877a40 100644
--- a/VoodooSMBus/VoodooSMBusControllerDriver.cpp
+++ b/VoodooSMBus/VoodooSMBusControllerDriver.cpp
@@ -211,7 +211,12 @@ IOReturn VoodooSMBusControllerDriver::createNubGated(UInt8 address, IOService *p
     if (!nub) {
         return kIOReturnBadArgument;
     }
-    
+
+    if (getDevice(deviceList, address) != nullptr) {
+        IOLogError("Device at 0x%x already exists!", address);
+        return kIOReturnPortExists;
+    }
+
     auto *device_nub = OSTypeAlloc(VoodooSMBusDeviceNub);
     
     if (device_nub == nullptr ||