[PATCH 1/1] ole32: Disable other-process support in RevokeDragDrop().

[Aida Jonikienė]

From: Aida Jonikienė

The RoShade installer crashes because of ole32 trying to release
the OLE drop target from another process (which can't be accessed
despite it being a valid pointer).

Windows probably supports this behavior (but implementing it here
would require extra work and this is enough to make this app work).

Wine-Bug: https://bugs.winehq.org/show_bug.cgi?id=54912
---
 dlls/ole32/ole2.c | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/dlls/ole32/ole2.c b/dlls/ole32/ole2.c
index f4672b704ee..efee49a6ab5 100644
--- a/dlls/ole32/ole2.c
+++ b/dlls/ole32/ole2.c
@@ -618,6 +618,7 @@ HRESULT WINAPI RegisterDragDrop(HWND hwnd, LPDROPTARGET pDropTarget)
  */
 HRESULT WINAPI RevokeDragDrop(HWND hwnd)
 {
+  DWORD pid = 0;
   HANDLE map;
   IStream *stream;
   IDropTarget *drop_target;
@@ -631,6 +632,14 @@ HRESULT WINAPI RevokeDragDrop(HWND hwnd)
     return DRAGDROP_E_INVALIDHWND;
   }

+  /* block revoke for other processes windows */
+  GetWindowThreadProcessId(hwnd, &pid);
+  if (pid != GetCurrentProcessId())
+  {
+    FIXME("revoke for another process windows is disabled\n");
+    return DRAGDROP_E_INVALIDHWND;
+  }
+
   /* no registration data */
   if (!(map = get_droptarget_handle(hwnd)))
     return DRAGDROP_E_NOTREGISTERED;