[Bug 54300] New: LdrLoadDll illegal memory access on DllPath

[WineHQ Bugzilla]

https://bugs.winehq.org/show_bug.cgi?id=54300

Bug ID: 54300
           Summary: LdrLoadDll illegal memory access on DllPath
           Product: Wine
           Version: 7.22
          Hardware: x86-64
                OS: Linux
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: ntdll
          Assignee: [e-mail]
          Reporter: [e-mail]
      Distribution: ---

Created attachment 73867
  --> https://bugs.winehq.org/attachment.cgi?id=73867
Reproducer

See reproducer (attached)

DllPath can be search flags, which is indicated by passing a pointer where the
lowest bit is set. This is not handled in wine, which calls wcslen on it: 
https://github.com/wine-mirror/wine/blob/a8c1d5c108fc57e4d78e9db126f395c8908...

The path resolution is correctly implemented in LdrGetDllPath, but that
function is not used (besides being an export).

Windows output:
Trying flag 00000200
Trying flag 00000400
Trying flag 00000800
Trying flag 00001000
Trying flag 00002000
Trying flag 00004000

Wine output:
Trying flag 00000200
wine: Unhandled page fault on read access to 0000000000000201 at address
0000000170069B40 (thread 05ec), starting debugger...