[gschneider] 43487: [kernel32] IsBadStringPtrA/W: - Remove overflow failure case, this isn't checked for string validation - Adapt page check to let the full string be checked in case of overflow See issue #4861 for more details.

Author: gschneider
Date: Thu Oct 15 21:12:37 2009
New Revision: 43487

URL: http://svn.reactos.org/svn/reactos?rev=43487&view=rev
Log:
[kernel32] IsBadStringPtrA/W:
- Remove overflow failure case, this isn't checked for string validation
- Adapt page check to let the full string be checked in case of overflow
See issue #4861 for more details.

Modified:
    trunk/reactos/dll/win32/kernel32/mem/isbad.c

Modified: trunk/reactos/dll/win32/kernel32/mem/isbad.c
URL:
http://svn.reactos.org/svn/reactos/trunk/reactos/dll/win32/kernel32/mem/isb…
==============================================================================
--- trunk/reactos/dll/win32/kernel32/mem/isbad.c [iso-8859-1] (original)
+++ trunk/reactos/dll/win32/kernel32/mem/isbad.c [iso-8859-1] Thu Oct 15 21:12:37 2009
@@ -171,9 +171,6 @@
     /* Calculate the last page */
     Last = (PWCHAR)((ULONG_PTR)lpsz + (ucchMax * 2) - 2);
 
-    /* Another quick failure case */
-    if ((ULONG_PTR)Last < (ULONG_PTR)lpsz) return TRUE;
-
     /* Enter SEH */
     _SEH2_TRY
     {
@@ -184,7 +181,7 @@
         {
             Char = *Current;
             Current++;
-        } while (Char && (Current <= Last));
+        } while (Char && (Current != Last));
     }
     _SEH2_EXCEPT(EXCEPTION_EXECUTE_HANDLER)
     {
@@ -217,9 +214,6 @@
     /* Calculate the last page */
     Last = (PCHAR)((ULONG_PTR)lpsz + ucchMax - 1);
 
-    /* Another quick failure case */
-    if ((ULONG_PTR)Last < (ULONG_PTR)lpsz) return TRUE;
-
     /* Enter SEH */
     _SEH2_TRY
     {
@@ -230,7 +224,7 @@
         {
             Char = *Current;
             Current++;
-        } while (Char && (Current <= Last));
+        } while (Char && (Current != Last));
     }
     _SEH2_EXCEPT(EXCEPTION_EXECUTE_HANDLER)
     {