kernel32: Allow to pass NULL as old protection in VirtualProtect for Win9x compatibility.

Signed-off-by: Michael Müller <michael@fds-team.de> Signed-off-by: Sebastian Lackner <sebastian@fds-team.de> Signed-off-by: Alexandre Julliard <julliard@winehq.org>

kernel32: Allow to pass NULL as old protection in VirtualProtect for Win9x compatibility.
8eb893f1 · Michael Müller · Alexandre Julliard · b5f210dd · 8eb893f1
Commit 8eb893f1 authored Feb 16, 2016 by Michael Müller Committed by Alexandre Julliard Feb 16, 2016
Hide whitespace changes
Inline Side-by-side

Showing with 7 additions and 1 deletion

virtual.c dlls/kernel32/virtual.c +7 -1

No files found.
--- a/dlls/kernel32/virtual.c
+++ b/dlls/kernel32/virtual.c
@@ -235,7 +235,13 @@ 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 prot;
+
+    /* Win9x allows to pass NULL as old_prot while it fails on NT */
+    if (!old_prot && (GetVersion() & 0x80000000)) old_prot = &prot;
+
+    status = NtProtectVirtualMemory( process, &addr, &size, new_prot, old_prot );
    if (status) SetLastError( RtlNtStatusToDosError(status) );
    return !status;
 }