[sginsberg] 35042: - ExpLookupHandleTableEntry: Apply same changes as was done for ExpFreeHandleTable and ExpAllocateHandleTableEntrySlow in 34467 - ExpAllocateHandleTableEntry: Fail if we don't find a handle table entry

Author: sginsberg
Date: Sat Aug  2 13:25:53 2008
New Revision: 35042

URL: http://svn.reactos.org/svn/reactos?rev=35042&view=rev
Log:
- ExpLookupHandleTableEntry: Apply same changes as was done for ExpFreeHandleTable and
ExpAllocateHandleTableEntrySlow in 34467
- ExpAllocateHandleTableEntry: Fail if we don't find a handle table entry

Modified:
    trunk/reactos/ntoskrnl/ex/handle.c

Modified: trunk/reactos/ntoskrnl/ex/handle.c
URL:
http://svn.reactos.org/svn/reactos/trunk/reactos/ntoskrnl/ex/handle.c?rev=3…
==============================================================================
--- trunk/reactos/ntoskrnl/ex/handle.c [iso-8859-1] (original)
+++ trunk/reactos/ntoskrnl/ex/handle.c [iso-8859-1] Sat Aug  2 13:25:53 2008
@@ -35,8 +35,10 @@
 ExpLookupHandleTableEntry(IN PHANDLE_TABLE HandleTable,
                           IN EXHANDLE LookupHandle)
 {
-    ULONG i, j, k, TableLevel, NextHandle;
-    ULONG_PTR TableBase;
+    ULONG i, j, k, NextHandle;
+    ULONG_PTR TableCode = HandleTable->TableCode;
+    ULONG_PTR TableBase = TableCode & ~3;
+    ULONG TableLevel = (ULONG)(TableCode & 3);
     PHANDLE_TABLE_ENTRY Entry = NULL;
     EXHANDLE Handle = LookupHandle;
     PUCHAR Level1, Level2, Level3;
@@ -45,13 +47,6 @@
     Handle.TagBits = 0;
     NextHandle = *(volatile ULONG*)&HandleTable->NextHandleNeedingPool;
     if (Handle.Value >= NextHandle) return NULL;
-
-    /* Get the table code */
-    TableBase = *(volatile ULONG_PTR*)&HandleTable->TableCode;
-
-    /* Extract the table level and actual table base */
-    TableLevel = (ULONG)(TableBase & 3);
-    TableBase = TableBase - TableLevel;
 
     /* Check what level we're running at */
     switch (TableLevel)
@@ -210,8 +205,8 @@
     PEPROCESS Process = HandleTable->QuotaProcess;
     ULONG i, j;
     ULONG_PTR TableCode = HandleTable->TableCode;
-    ULONG TableLevel = TableCode & 3;
     ULONG_PTR TableBase = TableCode & ~3;
+    ULONG TableLevel = (ULONG)(TableCode & 3);
     PHANDLE_TABLE_ENTRY Level1, *Level2, **Level3;
     PAGED_CODE();
 
@@ -733,6 +728,13 @@
 
         /* Lookup the entry for this handle */
         Entry = ExpLookupHandleTableEntry(HandleTable, Handle);
+
+        /* Make sure that we found an entry */
+        if (!Entry)
+        {
+            /* We didn't, fail */
+            return NULL;
+        }
 
         /* Get an available lock and acquire it */
         i = ((OldValue & FREE_HANDLE_MASK) >> 2) % 4;