[ros-diffs] [greatlrd] 20421: some case from win32k can call to RtlClearAllBits with NULL pointer. and check for null pointer after RtlClearAllBits. This take care of those case for moment.

[greatlrd at svn.reactos.org]

some case from win32k can call to RtlClearAllBits with NULL pointer. and
check for null pointer after RtlClearAllBits. This take care of those
case for moment.
Modified: trunk/reactos/lib/rtl/bitmap.c
  _____  

Modified: trunk/reactos/lib/rtl/bitmap.c
--- trunk/reactos/lib/rtl/bitmap.c	2005-12-29 13:13:14 UTC (rev
20420)
+++ trunk/reactos/lib/rtl/bitmap.c	2005-12-29 13:43:25 UTC (rev
20421)
@@ -125,9 +125,15 @@

 VOID NTAPI
 RtlClearAllBits(IN OUT PRTL_BITMAP BitMapHeader)
 {
-    memset(BitMapHeader->Buffer,
-	   0x00,
-	   ROUND_UP(BitMapHeader->SizeOfBitMap, 8) / 8);
+   if (BitMapHeader != NULL)
+   { 
+     if (BitMapHeader->Buffer != NULL)
+     {
+        memset(BitMapHeader->Buffer,
+	           0x00,
+	           ROUND_UP(BitMapHeader->SizeOfBitMap, 8) / 8);
+     }
+   }
 }
 
 
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