[tkreuzer] 56356: [NTOSKRNL] Fix SepGet*FromDescriptor, returning NULL, when the relative offset is 0. Fixes VMware tools installer.

Author: tkreuzer
Date: Wed Apr 18 11:27:03 2012
New Revision: 56356

URL: http://svn.reactos.org/svn/reactos?rev=56356&view=rev
Log:
[NTOSKRNL]
Fix SepGet*FromDescriptor, returning NULL, when the relative offset is 0.
Fixes VMware tools installer.

Modified:
    trunk/reactos/ntoskrnl/se/sd.c

Modified: trunk/reactos/ntoskrnl/se/sd.c
URL: http://svn.reactos.org/svn/reactos/trunk/reactos/ntoskrnl/se/sd.c?rev=56356&...
==============================================================================
--- trunk/reactos/ntoskrnl/se/sd.c [iso-8859-1] (original)
+++ trunk/reactos/ntoskrnl/se/sd.c [iso-8859-1] Wed Apr 18 11:27:03 2012
@@ -38,6 +38,7 @@
     if (Descriptor->Control & SE_SELF_RELATIVE)
     {
         SdRel = (PISECURITY_DESCRIPTOR_RELATIVE)Descriptor;
+        if (!SdRel->Group) return NULL;
         return (PSID)((ULONG_PTR)Descriptor + SdRel->Group);
     }
     else
@@ -56,6 +57,7 @@
     if (Descriptor->Control & SE_SELF_RELATIVE)
     {
         SdRel = (PISECURITY_DESCRIPTOR_RELATIVE)Descriptor;
+        if (!SdRel->Owner) return NULL;
         return (PSID)((ULONG_PTR)Descriptor + SdRel->Owner);
     }
     else
@@ -74,6 +76,7 @@
     if (Descriptor->Control & SE_SELF_RELATIVE)
     {
         SdRel = (PISECURITY_DESCRIPTOR_RELATIVE)Descriptor;
+        if (!SdRel->Dacl) return NULL;
         return (PACL)((ULONG_PTR)Descriptor + SdRel->Dacl);
     }
     else
@@ -92,6 +95,7 @@
     if (Descriptor->Control & SE_SELF_RELATIVE)
     {
         SdRel = (PISECURITY_DESCRIPTOR_RELATIVE)Descriptor;
+        if (!SdRel->Sacl) return NULL;
         return (PACL)((ULONG_PTR)Descriptor + SdRel->Sacl);
     }
     else