Hans Leidekker : oleaut32: Handle negative offsets into the custom data table.

[Alexandre Julliard]

Module: wine
Branch: master
Commit: 110d96634b3d514a1b7ac306563d2131db5443c5
URL:    http://source.winehq.org/git/wine.git/?a=commit;h=110d96634b3d514a1b7ac306563d2131db5443c5

Author: Hans Leidekker <hans at codeweavers.com>
Date:   Tue Jan 17 12:06:18 2012 +0100

oleaut32: Handle negative offsets into the custom data table.

Fixes a crash in the Visio 2002 installer.

---

 dlls/oleaut32/typelib.c |    2 ++
 1 files changed, 2 insertions(+), 0 deletions(-)

diff --git a/dlls/oleaut32/typelib.c b/dlls/oleaut32/typelib.c
index a5b0cdd..1cab886 100644
--- a/dlls/oleaut32/typelib.c
+++ b/dlls/oleaut32/typelib.c
@@ -1939,6 +1939,8 @@ static int MSFT_CustData( TLBContext *pcx, int offset, struct list *custdata_lis
 
     TRACE_(typelib)("\n");
 
+    if (pcx->pTblDir->pCDGuids.offset < 0) return 0;
+
     while(offset >=0){
         count++;
         pNew=heap_alloc_zero(sizeof(TLBCustData));