[NTOS]

Fix possible NULL pointer dereference. Spotted by Amine Khaldi.

svn path=/trunk/; revision=45137

diff --git a/reactos/ntoskrnl/mm/ARM3/contmem.c b/reactos/ntoskrnl/mm/ARM3/contmem.c
index c5565d2..890bd74 100644 (file)
--- a/reactos/ntoskrnl/mm/ARM3/contmem.c
+++ b/reactos/ntoskrnl/mm/ARM3/contmem.c
@@ -276,7 +276,7 @@ MiFreeContiguousMemory(IN PVOID BaseAddress)
     // Now get the PFN entry for this, and make sure it's the correct one
     //
     Pfn1 = MiGetPfnEntry(PageFrameIndex);        
-    if (Pfn1->u3.e1.StartOfAllocation == 0)
+    if ((!Pfn1) || (Pfn1->u3.e1.StartOfAllocation == 0))
     {
         //
         // This probably means you did a free on an address that was in between