From d6e577ced93fb03fa171fb10f6d22ac7802a7587 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Herm=C3=A8s=20B=C3=A9lusca-Ma=C3=AFto?=
 <hermes.belusca-maito@reactos.org>
Date: Sun, 9 Sep 2018 20:52:36 +0200
Subject: [PATCH] [SERVICES] RChangeServiceConfigW: Check valid usage of
 lpdwTagId when lpLoadOrderGroup is not specified.

---
 base/system/services/rpcserver.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/base/system/services/rpcserver.c b/base/system/services/rpcserver.c
index 351793736d6..3c5af07499d 100644
--- a/base/system/services/rpcserver.c
+++ b/base/system/services/rpcserver.c
@@ -1989,6 +1989,11 @@ RChangeServiceConfigW(
         (dwErrorControl != SERVICE_ERROR_CRITICAL))
         return ERROR_INVALID_PARAMETER;
 
+    if (lpdwTagId && (!lpLoadOrderGroup || !*lpLoadOrderGroup))
+    {
+        return ERROR_INVALID_PARAMETER;
+    }
+
     lpService = hSvc->ServiceEntry;
     if (lpService == NULL)
     {