[reactos] 01/01: [UMPNPMGR] Add checks to PNP_GetRelatedDeviceInstance

[Eric Kohl]

https://git.reactos.org/?p=reactos.git;a=commitdiff;h=7cc5163bfa5972597bc28…

commit 7cc5163bfa5972597bc2827393626e880b8ec311
Author:     Eric Kohl <eric.kohl(a)reactos.org>
AuthorDate: Sun Apr 17 13:52:59 2022 +0200
Commit:     Eric Kohl <eric.kohl(a)reactos.org>
CommitDate: Sun Apr 17 13:52:59 2022 +0200

    [UMPNPMGR] Add checks to PNP_GetRelatedDeviceInstance
    
    PNP_GetRelatedDeviceInstance must fail if we try to retrieve the parent or a sibling
of the root device.
---
 base/services/umpnpmgr/rpcserver.c | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/base/services/umpnpmgr/rpcserver.c b/base/services/umpnpmgr/rpcserver.c
index 34bdf848966..470a9b67622 100644
--- a/base/services/umpnpmgr/rpcserver.c
+++ b/base/services/umpnpmgr/rpcserver.c
@@ -781,6 +781,14 @@ PNP_GetRelatedDeviceInstance(
     if (!IsValidDeviceInstanceID(pDeviceID))
         return CR_INVALID_DEVINST;
 
+    /* The root device does not have a parent device or sibling devices */
+    if ((ulRelationship == PNP_GET_PARENT_DEVICE_INSTANCE) ||
+        (ulRelationship == PNP_GET_SIBLING_DEVICE_INSTANCE))
+    {
+        if (IsRootDeviceInstanceID(pDeviceID))
+            return CR_NO_SUCH_DEVINST;
+    }
+
     RtlInitUnicodeString(&PlugPlayData.TargetDeviceInstance,
                          pDeviceID);