Index: section.c
===================================================================
--- ntoskrnl/mm/ARM3/section.c	(revision 72799)
+++ ntoskrnl/mm/ARM3/section.c	(working copy)
@@ -1898,6 +1898,7 @@
     WCHAR ModuleFileNameBuffer[MAX_PATH] = {0};
     UNICODE_STRING ModuleFileName;
     PMEMORY_SECTION_NAME SectionName = NULL;
+    ULONG NameBufferLength;
     KPROCESSOR_MODE PreviousMode = ExGetPreviousMode();
 
     Status = ObReferenceObjectByHandle(ProcessHandle,
@@ -1919,16 +1920,20 @@
     if (NT_SUCCESS(Status))
     {
         SectionName = MemoryInformation;
+        NameBufferLength = MemoryInformationLength - FIELD_OFFSET(MEMORY_SECTION_NAME, NameBuffer);
         if (PreviousMode != KernelMode)
         {
             _SEH2_TRY
             {
-                RtlInitUnicodeString(&SectionName->SectionFileName, SectionName->NameBuffer);
-                SectionName->SectionFileName.MaximumLength = (USHORT)MemoryInformationLength;
+                RtlInitEmptyUnicodeString(&SectionName->SectionFileName,
+                                          SectionName->NameBuffer,
+                                          NameBufferLength);
                 RtlCopyUnicodeString(&SectionName->SectionFileName, &ModuleFileName);
 
-                if (ReturnLength) *ReturnLength = ModuleFileName.Length;
-
+                if (ReturnLength)
+                {
+                    *ReturnLength = ModuleFileName.Length + FIELD_OFFSET(MEMORY_SECTION_NAME, NameBuffer);
+                }
             }
             _SEH2_EXCEPT(EXCEPTION_EXECUTE_HANDLER)
             {
@@ -1938,12 +1943,15 @@
         }
         else
         {
-            RtlInitUnicodeString(&SectionName->SectionFileName, SectionName->NameBuffer);
-            SectionName->SectionFileName.MaximumLength = (USHORT)MemoryInformationLength;
+            RtlInitEmptyUnicodeString(&SectionName->SectionFileName,
+                                      SectionName->NameBuffer,
+                                      NameBufferLength);
             RtlCopyUnicodeString(&SectionName->SectionFileName, &ModuleFileName);
 
-            if (ReturnLength) *ReturnLength = ModuleFileName.Length;
-
+            if (ReturnLength)
+            {
+                *ReturnLength = ModuleFileName.Length + FIELD_OFFSET(MEMORY_SECTION_NAME, NameBuffer);
+            }
         }
     }
     ObDereferenceObject(Process);