From a976ebb0315a0b27438edb04fd69555e7de732df Mon Sep 17 00:00:00 2001
From: Thomas Faber <thomas.faber@reactos.org>
Date: Sun, 24 Mar 2019 10:55:04 +0100
Subject: [PATCH] [NTOS:IO] Avoid an unnecessary stack buffer in
 OpenRegistryHandlesFromSymbolicLink. CORE-15882

---
 ntoskrnl/io/iomgr/deviface.c | 7 +------
 1 file changed, 1 insertion(+), 6 deletions(-)

diff --git a/ntoskrnl/io/iomgr/deviface.c b/ntoskrnl/io/iomgr/deviface.c
index 0e1f32f5ca4..34245027627 100644
--- a/ntoskrnl/io/iomgr/deviface.c
+++ b/ntoskrnl/io/iomgr/deviface.c
@@ -37,7 +37,6 @@ OpenRegistryHandlesFromSymbolicLink(IN PUNICODE_STRING SymbolicLinkName,
                                     IN OPTIONAL PHANDLE InstanceKey)
 {
     OBJECT_ATTRIBUTES ObjectAttributes;
-    WCHAR PathBuffer[MAX_PATH];
     UNICODE_STRING BaseKeyU;
     UNICODE_STRING GuidString, SubKeyName, ReferenceString;
     PWCHAR StartPosition, EndPosition;
@@ -67,11 +66,7 @@ OpenRegistryHandlesFromSymbolicLink(IN PUNICODE_STRING SymbolicLinkName,
     *DeviceKeyRealP = NULL;
     *InstanceKeyRealP = NULL;
 
-    BaseKeyU.Buffer = PathBuffer;
-    BaseKeyU.Length = 0;
-    BaseKeyU.MaximumLength = MAX_PATH * sizeof(WCHAR);
-
-    RtlAppendUnicodeToString(&BaseKeyU, BaseKeyString);
+    RtlInitUnicodeString(&BaseKeyU, BaseKeyString);
 
     /* Open the DeviceClasses key */
     InitializeObjectAttributes(&ObjectAttributes,