[Bug 52259] New: osu! sometimes crashes in select()

[WineHQ Bugzilla]

https://bugs.winehq.org/show_bug.cgi?id=52259

Bug ID: 52259
           Summary: osu! sometimes crashes in select()
           Product: Wine
           Version: unspecified
          Hardware: x86-64
                OS: Linux
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: winsock
          Assignee: [e-mail]
          Reporter: [e-mail]
      Distribution: ---

In an osu! Discord server I'm in I've received multiple reports of osu!
crashing, with the stack trace given by the game ending in
System.Net.UnsafeNclNativeMethods.OSSOCK.select.
According to old .NET Core code the .NET Framework calls select() with manually
constructed `fd_set`s consisting of only two pointers. Since Wine always reads
the whole fd_set, if these allocations fall on the edge of the heap Wine tries
to read past the end of the heap and segfaults.