server: Make enum_winstations enumerate all the window stations with WINSTA_ENUMERATE right.

server/winstation.c

@@ -37,6 +37,7 @@
 #include "process.h"
 #include "user.h"
 #include "file.h"
+#include "security.h"
 #include "wine/unicode.h"
 
 
@@ -636,16 +637,15 @@ DECL_HANDLER(set_user_object_info)
 /* enumerate window stations */
 DECL_HANDLER(enum_winstation)
 {
-    unsigned int index = req->index;
-    obj_handle_t handle;
-    struct object *obj;
+    unsigned int index = 0;
+    struct winstation *winsta;
 
-    while ((handle = enumerate_handles( current->process, &winstation_ops, &index )))
+    LIST_FOR_EACH_ENTRY( winsta, &winstation_list, struct winstation, entry )
     {
-        if (!(obj = get_handle_obj( current->process, handle, WINSTA_ENUMERATE, &winstation_ops )))
-            continue;
-        set_reply_data_obj_name( obj );
-        release_object( obj );
+        unsigned int access = WINSTA_ENUMERATE;
+        if (req->index > index++) continue;
+        if (!check_object_access( &winsta->obj, &access )) continue;
+        set_reply_data_obj_name( &winsta->obj );
         clear_error();
         reply->next = index;
         return;