From 6ca6102f0f4c52dee00013a8e1d0d924f4b6c5a7 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Michael=20M=C3=BCller?= <michael@fds-team.de>
Date: Sat, 14 May 2016 17:21:54 +0200
Subject: kernel32: Fail in UnmapViewOfFile on Win 9X when addr is not a base
 address of a mapping.

---
 dlls/kernel32/virtual.c | 14 +++++++++++++-
 1 file changed, 13 insertions(+), 1 deletion(-)

diff --git a/dlls/kernel32/virtual.c b/dlls/kernel32/virtual.c
index 32f2d65..7e9c2f3 100644
--- a/dlls/kernel32/virtual.c
+++ b/dlls/kernel32/virtual.c
@@ -576,7 +576,19 @@ LPVOID WINAPI MapViewOfFileEx( HANDLE handle, DWORD access,
  */
 BOOL WINAPI UnmapViewOfFile( LPCVOID addr )
 {
-    NTSTATUS status = NtUnmapViewOfSection( GetCurrentProcess(), (void *)addr );
+    NTSTATUS status;
+
+    if (GetVersion() & 0x80000000)
+    {
+        MEMORY_BASIC_INFORMATION info;
+        if (!VirtualQuery( addr, &info, sizeof(info) ) || info.AllocationBase != addr)
+        {
+            SetLastError( ERROR_INVALID_ADDRESS );
+            return FALSE;
+        }
+    }
+
+    status = NtUnmapViewOfSection( GetCurrentProcess(), (void *)addr );
     if (status) SetLastError( RtlNtStatusToDosError(status) );
     return !status;
 }
-- 
2.8.0