[Bug 56154] New: Potential nullpointer dereference in wow64_NtQueryInformationToken (Coverity)

[WineHQ Bugzilla]

https://bugs.winehq.org/show_bug.cgi?id=56154

Bug ID: 56154
           Summary: Potential nullpointer dereference in
                    wow64_NtQueryInformationToken (Coverity)
           Product: Wine
           Version: 9.0-rc3
          Hardware: x86-64
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: P2
         Component: -unknown
          Assignee: [e-mail]
          Reporter: [e-mail]
      Distribution: ---

In wow64_NtQueryInformationToken we have the following code:
> dacl32->DefaultDacl = dacl->DefaultDacl ? PtrToUlong( dacl32 + 1 ) : 0;
> memcpy( dacl32 + 1, dacl->DefaultDacl, ret_size - sizeof(*dacl) );

I think memcpy might actually work will nullpointers, although it doesn't seem
right.

Coverity link:
https://scan5.scan.coverity.com/reports.htm#v60945/p10088/fileInstanceId=257...