Index: drivers/hid/hidclass/pdo.c
===================================================================
--- drivers/hid/hidclass/pdo.c	(revision 74283)
+++ drivers/hid/hidclass/pdo.c	(working copy)
@@ -648,12 +648,13 @@
     //
     FDODeviceExtension = DeviceObject->DeviceExtension;
     ASSERT(FDODeviceExtension->Common.IsFDO);
+    ASSERT(FDODeviceExtension->Common.DeviceDescription.CollectionDescLength);
 
     //
     // first allocate device relations
     //
-    Length = sizeof(DEVICE_RELATIONS) + sizeof(PDEVICE_OBJECT) * FDODeviceExtension->Common.DeviceDescription.CollectionDescLength;
-    DeviceRelations = ExAllocatePoolWithTag(NonPagedPool, Length, HIDCLASS_TAG);
+    Length = FIELD_OFFSET(DEVICE_RELATIONS, Objects) + sizeof(PDEVICE_OBJECT) * FDODeviceExtension->Common.DeviceDescription.CollectionDescLength;
+    DeviceRelations = ExAllocatePoolWithTag(PagedPool, Length, HIDCLASS_TAG);
     if (!DeviceRelations)
     {
         //