[jgardou] 52616: [NTOSKRNL/MM] - The initial region does not necessarily begins with the asked address, calculate remaining space acccordingly.

Author: jgardou
Date: Sun Jul 10 19:24:49 2011
New Revision: 52616

URL: http://svn.reactos.org/svn/reactos?rev=52616&view=rev
Log:
[NTOSKRNL/MM]
- The initial region does not necessarily begins with the asked address, calculate
remaining space acccordingly.

Modified:
    trunk/reactos/ntoskrnl/mm/region.c

Modified: trunk/reactos/ntoskrnl/mm/region.c
URL:
http://svn.reactos.org/svn/reactos/trunk/reactos/ntoskrnl/mm/region.c?rev=5…
==============================================================================
--- trunk/reactos/ntoskrnl/mm/region.c [iso-8859-1] (original)
+++ trunk/reactos/ntoskrnl/mm/region.c [iso-8859-1] Sun Jul 10 19:24:49 2011
@@ -135,16 +135,20 @@
       {
          return(STATUS_NO_MEMORY);
       }
+      if(NewRegion->Length < Length)
+         RemainingLength = Length - NewRegion->Length;
+      else
+         RemainingLength = 0;
    }
    else
    {
       NewRegion = InitialRegion;
-   }
-   
-   if(NewRegion->Length < Length)
-      RemainingLength = Length - NewRegion->Length;
-   else
-      RemainingLength = 0;
+      if(((ULONG_PTR)InitialBaseAddress + NewRegion->Length) < 
+            ((ULONG_PTR)StartAddress + Length))
+         RemainingLength = ((ULONG_PTR)StartAddress + Length) -
((ULONG_PTR)InitialBaseAddress + NewRegion->Length);
+      else
+         RemainingLength = 0;
+   }
 
    /*
     * Free any complete regions that are containing in the range of addresses