[Bug 20253] New: Regression: Change to OLE32 causes page fault (problematic commit attached)

http://bugs.winehq.org/show_bug.cgi?id=20253

Summary: Regression: Change to OLE32 causes page fault
                    (problematic commit attached)
           Product: Wine
           Version: 1.1.30
          Platform: PC
        OS/Version: Linux
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: ole32
        AssignedTo: [e-mail]
        ReportedBy: [e-mail]
                CC: [e-mail]

Created an attachment (id=23895)
 --> (http://bugs.winehq.org/attachment.cgi?id=23895)
commit 7b6dd2c9f8339a0bc14aa7f466f5c5a0bb03da06 by Alexandre Julliard

A commit back in March appears to have introduced a bug in which
StringFromGUID2() gets provided a null argument, and crashes.

I noticed this when trying to get WWII Online: Battleground Europe running.
This bug was not present in 1.0.1 (which ships with Ubuntu), but was present in
1.1.30.

In short, when you try to start the 'Settings.exe' program that comes with the
game, it crashes with a page fault.

I did a git bisect, and isolated the commit that introduced this behaviour. I
am attaching it, along with a backtrace which resulted from the crash.

If there is anything else I can provide, let me know.

Regards,

Brian