[fireball] 35831: - Fix over-reading the input buffer (sometimes by even more than 400 bytes), and hashing random pool contents instead of the specified buffer.

Author: fireball
Date: Sun Aug 31 06:55:17 2008
New Revision: 35831
URL: http://svn.reactos.org/svn/reactos?rev=35831&view=rev
Log:
- Fix over-reading the input buffer (sometimes by even more than 400 bytes), and hashing
random pool contents instead of the specified buffer.
Modified:
    trunk/reactos/ntoskrnl/ob/obsdcach.c
Modified: trunk/reactos/ntoskrnl/ob/obsdcach.c
URL:
http://svn.reactos.org/svn/reactos/trunk/reactos/ntoskrnl/ob/obsdcach.c?rev…
==============================================================================
--- trunk/reactos/ntoskrnl/ob/obsdcach.c [iso-8859-1] (original)
+++ trunk/reactos/ntoskrnl/ob/obsdcach.c [iso-8859-1] Sun Aug 31 06:55:17 2008
@@ -81,11 +81,12 @@
     PULONG p, pp;
     PUCHAR pb, ppb;
     ULONG Hash = 0;
-
+
     /* Setup aligned and byte buffers */
     p = Buffer;
+    pb = (PUCHAR)p;
     ppb = (PUCHAR)((ULONG_PTR)Buffer + Length);
-    pp = (PULONG)ALIGN_DOWN(p + Length, ULONG);
+    pp = (PULONG)ALIGN_DOWN(pb + Length, ULONG);
     /* Loop aligned data */
     while (p < pp)
@@ -94,7 +95,7 @@
         Hash ^= *p++;
         Hash = _rotl(Hash, 3);
     }
-
+
     /* Loop non-aligned data */
     pb = (PUCHAR)p;
     while (pb < ppb)