Index: section.c
===================================================================
--- ntoskrnl/mm/section.c	(revision 74432)
+++ ntoskrnl/mm/section.c	(working copy)
@@ -2708,7 +2708,12 @@
         }
         else
         {
-            (void)InterlockedDecrementUL(&Section->Segment->ReferenceCount);
+            PMM_SECTION_SEGMENT Segment = Section->Segment;
+            if (InterlockedDecrementUL(&Segment->ReferenceCount) == 0)
+            {
+                Section->Segment = NULL;
+                MmFinalizeSegment(Segment);
+            }
         }
     }
     if (Section->FileObject != NULL)