From d14a5ed33cdc95ff03c64f6fa574d07da5515825 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Michael=20M=C3=BCller?= <michael@fds-team.de>
Date: Sat, 6 Feb 2016 21:23:10 +0100
Subject: kernel32: Allow to pass NULL as old protection in VirtualProtect for
 Win9X.

---
 dlls/kernel32/virtual.c | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

diff --git a/dlls/kernel32/virtual.c b/dlls/kernel32/virtual.c
index 03ef38c..e164151 100644
--- a/dlls/kernel32/virtual.c
+++ b/dlls/kernel32/virtual.c
@@ -235,7 +235,14 @@ BOOL WINAPI VirtualProtect( LPVOID addr, SIZE_T size, DWORD new_prot, LPDWORD ol
 BOOL WINAPI VirtualProtectEx( HANDLE process, LPVOID addr, SIZE_T size,
     DWORD new_prot, LPDWORD old_prot )
 {
-    NTSTATUS status = NtProtectVirtualMemory( process, &addr, &size, new_prot, old_prot );
+    NTSTATUS status;
+    DWORD dummy;
+
+    /* Win9x allows to pass NULL as old_prot while it fails on NT */
+    if (!old_prot && (GetVersion() & 0x80000000))
+        old_prot = &dummy;
+
+    status = NtProtectVirtualMemory( process, &addr, &size, new_prot, old_prot );
     if (status) SetLastError( RtlNtStatusToDosError(status) );
     return !status;
 }
-- 
2.7.0