Index: ntoskrnl/fsrtl/filelock.c
===================================================================
--- ntoskrnl/fsrtl/filelock.c	(revision 62493)
+++ ntoskrnl/fsrtl/filelock.c	(working copy)
@@ -1028,6 +1028,8 @@
                    IN PEPROCESS Process,
                    IN PVOID Context OPTIONAL)
 {
+    NTSTATUS Status;
+    PEPROCESS EProcess = NULL;
     PLIST_ENTRY ListEntry;
     PCOMBINED_LOCK_ELEMENT Entry;
     PLOCK_INFORMATION InternalInfo = FileLock->LockInformation;
@@ -1046,15 +1048,18 @@
         ListEntry = ListEntry->Flink;
         if (Range->ProcessId != Process->UniqueProcessId)
             continue;
+        Status = PsLookupProcessByProcessId(Range->ProcessId, &EProcess);
+        ASSERT(NT_SUCCESS(Status));
         FsRtlFastUnlockSingle
             (FileLock,
              FileObject,
              &Range->Start,
              &Length,
-             Range->ProcessId,
+             EProcess,
              Range->Key,
              Context,
              TRUE);
+        ObDereferenceObject((PVOID)EProcess);
     }
     for (Entry = RtlEnumerateGenericTable(&InternalInfo->RangeTable, TRUE);
          Entry;
@@ -1061,6 +1066,8 @@
          Entry = RtlEnumerateGenericTable(&InternalInfo->RangeTable, FALSE))
     {
         LARGE_INTEGER Length;
+        Status = PsLookupProcessByProcessId(Entry->Exclusive.FileLock.ProcessId, &EProcess);
+        ASSERT(NT_SUCCESS(Status));
         // We'll take the first one to be the list head, and free the others first...
         Length.QuadPart = 
             Entry->Exclusive.FileLock.EndingByte.QuadPart - 
@@ -1070,10 +1077,11 @@
              Entry->Exclusive.FileLock.FileObject,
              &Entry->Exclusive.FileLock.StartingByte,
              &Length,
-             Entry->Exclusive.FileLock.ProcessId,
+             EProcess,
              Entry->Exclusive.FileLock.Key,
              Context,
              TRUE);
+        ObDereferenceObject((PVOID)EProcess);
     }
     DPRINT("Done %wZ\n", &FileObject->FileName);
     return STATUS_SUCCESS;
@@ -1090,6 +1098,8 @@
                         IN ULONG Key,
                         IN PVOID Context OPTIONAL)
 {
+    NTSTATUS Status;
+    PEPROCESS EProcess = NULL;
     PLIST_ENTRY ListEntry;
     PCOMBINED_LOCK_ELEMENT Entry;
     PLOCK_INFORMATION InternalInfo = FileLock->LockInformation;
@@ -1108,15 +1118,18 @@
         if (Range->ProcessId != Process->UniqueProcessId ||
             Range->Key != Key)
             continue;
+        Status = PsLookupProcessByProcessId(Range->ProcessId, &EProcess);
+        ASSERT(NT_SUCCESS(Status));
         FsRtlFastUnlockSingle
             (FileLock,
              FileObject,
              &Range->Start,
              &Length,
-             Range->ProcessId,
+             EProcess,
              Range->Key,
              Context,
              TRUE);
+           ObDereferenceObject((PVOID)EProcess);
     }
     for (Entry = RtlEnumerateGenericTable(&InternalInfo->RangeTable, TRUE);
          Entry;
@@ -1130,15 +1143,18 @@
         if (Entry->Exclusive.FileLock.Key == Key && 
             Entry->Exclusive.FileLock.ProcessId == Process->UniqueProcessId)
         {
+            Status = PsLookupProcessByProcessId(Entry->Exclusive.FileLock.ProcessId, &EProcess);
+            ASSERT(NT_SUCCESS(Status));
             FsRtlFastUnlockSingle
                 (FileLock, 
                  Entry->Exclusive.FileLock.FileObject,
                  &Entry->Exclusive.FileLock.StartingByte,
                  &Length,
-                 Entry->Exclusive.FileLock.ProcessId,
+                 EProcess,
                  Entry->Exclusive.FileLock.Key,
                  Context,
                  TRUE);
+            ObDereferenceObject((PVOID)EProcess);
         }
     }