From 5706f6e9f4b237ada8098938ca2d4580f28d458a Mon Sep 17 00:00:00 2001
From: Thomas Faber <thomas.faber@reactos.org>
Date: Thu, 18 Apr 2019 07:41:50 +0200
Subject: [PATCH] [NTOS:PNP] Reduce the size of the pool buffer in
 IopGetParentIdPrefix. CORE-15882

---
 ntoskrnl/io/pnpmgr/pnpmgr.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/ntoskrnl/io/pnpmgr/pnpmgr.c b/ntoskrnl/io/pnpmgr/pnpmgr.c
index b4f59f4d17e..e5530c61714 100644
--- a/ntoskrnl/io/pnpmgr/pnpmgr.c
+++ b/ntoskrnl/io/pnpmgr/pnpmgr.c
@@ -1853,7 +1853,7 @@ IopGetParentIdPrefix(PDEVICE_NODE DeviceNode,
     }
 
     /* 1. Try to retrieve ParentIdPrefix from registry */
-    KeyNameBufferLength = FIELD_OFFSET(KEY_VALUE_PARTIAL_INFORMATION, Data[0]) + MAX_PATH * sizeof(WCHAR);
+    KeyNameBufferLength = FIELD_OFFSET(KEY_VALUE_PARTIAL_INFORMATION, Data) + sizeof(L"12345678&12345678");
     ParentIdPrefixInformation = ExAllocatePoolWithTag(PagedPool,
                                                       KeyNameBufferLength + sizeof(UNICODE_NULL),
                                                       TAG_IO);