[Bug 55835] New: putenv clobbers previous getenv

[WineHQ Bugzilla]

https://bugs.winehq.org/show_bug.cgi?id=55835

Bug ID: 55835
           Summary: putenv clobbers previous getenv
           Product: Wine
           Version: 8.17
          Hardware: x86-64
                OS: Linux
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: msvcrt
          Assignee: [e-mail]
          Reporter: [e-mail]
      Distribution: ---

Created attachment 75335
  --> https://bugs.winehq.org/attachment.cgi?id=75335
Sample code

performing a putenv/_putenv_s to an empty string will clobber a previous
getenv. There may be other cases, but this is the one I ran into. I've attached
sample code.

On Windows it returns:
AMD64 Family 23 Model 1 Stepping 2, AuthenticAMD
AMD64 Family 23 Model 1 Stepping 2, AuthenticAMD

On Wine it returns:
x86 Family 6 Model 79 Stepping 1, GenuineIntel
Family 6 Model 79 Stepping 1, GenuineIntel

The string is globbered by the _setenv_s due to the shift in memory by removing
another environment variable.