https://git.reactos.org/?p=reactos.git;a=commitdiff;h=d6e577ced93fb03fa171fb10f6d22ac7802a7587

commit d6e577ced93fb03fa171fb10f6d22ac7802a7587
Author:     Hermès Bélusca-Maïto <[email protected]>
AuthorDate: Sun Sep 9 20:52:36 2018 +0200
Commit:     Hermès Bélusca-Maïto <[email protected]>
CommitDate: Sun Sep 9 23:23:55 2018 +0200

    [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 351793736d..3c5af07499 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)
     {

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