From b4c1b96d96d6cd3abb5c6824418f6d3c5f938fe0 Mon Sep 17 00:00:00 2001
From: Tom <tomut@yahoo.com>
Date: Sun, 28 Feb 2021 13:58:21 -0700
Subject: [PATCH] Kernel: Fix scrolling up in VMware

The mouse wheel delta is provided as a signed 8 bit value.
---
 Kernel/Devices/VMWareBackdoor.cpp | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/Kernel/Devices/VMWareBackdoor.cpp b/Kernel/Devices/VMWareBackdoor.cpp
index d69cc31d9b4..87311ceb26a 100644
--- a/Kernel/Devices/VMWareBackdoor.cpp
+++ b/Kernel/Devices/VMWareBackdoor.cpp
@@ -231,7 +231,7 @@ Optional<MousePacket> VMWareBackdoor::receive_mouse_packet()
     int buttons = (command.ax & 0xFFFF);
     int x = (command.bx);
     int y = (command.cx);
-    int z = (command.dx);
+    int z = (i8)(command.dx); // signed 8 bit value only!
 
     if constexpr (PS2MOUSE_DEBUG) {
         dbgln("Absolute Mouse: Buttons {:x}", buttons);