Alexandre Julliard : ntdll: Add check for null pointer in NtQuerySystemInformation( SystemModuleInformation).

[Alexandre Julliard]

Module: wine
Branch: master
Commit: 68a6182188e2cf83f9c0647abc5f2446bbe2408d
URL:    http://source.winehq.org/git/wine.git/?a=commit;h=68a6182188e2cf83f9c0647abc5f2446bbe2408d

Author: Alexandre Julliard <julliard at winehq.org>
Date:   Wed Jul  4 12:07:22 2007 +0200

ntdll: Add check for null pointer in NtQuerySystemInformation(SystemModuleInformation).

---

 dlls/ntdll/nt.c |    3 ++-
 1 files changed, 2 insertions(+), 1 deletions(-)

diff --git a/dlls/ntdll/nt.c b/dlls/ntdll/nt.c
index ed707c0..a303dcf 100644
--- a/dlls/ntdll/nt.c
+++ b/dlls/ntdll/nt.c
@@ -845,7 +845,8 @@ NTSTATUS WINAPI NtQuerySystemInformation(
         break;
     case SystemModuleInformation:
         /* FIXME: should be system-wide */
-        ret = LdrQueryProcessModuleInformation( SystemInformation, Length, &len );
+        if (!SystemInformation) ret = STATUS_ACCESS_VIOLATION;
+        else ret = LdrQueryProcessModuleInformation( SystemInformation, Length, &len );
         break;
     case SystemHandleInformation:
         {