[Bug 41066] New: Unhandled page fault in RtlWow64EnableFsRedirectionEx when passed bad *old_value pointer

[wine-bugs at winehq.org]

https://bugs.winehq.org/show_bug.cgi?id=41066

            Bug ID: 41066
           Summary: Unhandled page fault in RtlWow64EnableFsRedirectionEx
                    when passed bad *old_value pointer
           Product: Wine
           Version: 1.9.15
          Hardware: x86-64
                OS: Linux
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: ntdll
          Assignee: wine-bugs at winehq.org
          Reporter: wine-bugzilla at nerdoftheherd.com
      Distribution: ---

If Wine's RtlWow64EnableFsRedirectionEx (when running under WoW64) is passed a
bad pointer value that doesn't start with 0x0000, this causes an unhandled page
fault instead of returning the value STATUS_ACCESS_VIOLATION as Windows does.

I discovered this behaviour when attempting to install the Dymo LabelWriter
software, as for some reason the installer calls Wow64DisableWow64FsRedirection
with a pointer value of 0x10000000 instead of a real memory location, which is
then passed along to RtlWow64EnableFsRedirectionEx.

I have a patch nearly ready to submit to fix this issue, but wanted to raise a
bug so that it can be linked to the appdb.

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