[Bug 49206] New: ITHVNR: hooked processes segfault

[WineHQ Bugzilla]

https://bugs.winehq.org/show_bug.cgi?id=49206

            Bug ID: 49206
           Summary: ITHVNR: hooked processes segfault
           Product: Wine
           Version: 5.5
          Hardware: x86-64
               URL: https://a.pomf.cat/tnuaqd.zip
                OS: Linux
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: -unknown
          Assignee: wine-bugs at winehq.org
          Reporter: mokouthrowaway at gmail.com
                CC: julliard at winehq.org
   Regression SHA1: 6226be3656e706d3d389cdcbf63a2ad19d861e30
      Distribution: Gentoo

Download (no official English build of this version is available):
https://a.pomf.cat/tnuaqd.zip
Source code: https://github.com/mireado/ITHVNR/tree/d28a1ae
sha1sum of the zip file: 74bfce584012426f117551eddfa04bbee1998a6e 
ITHVNR-gd28a1ae.zip
sha1sum ITHVNR* vnr*:
629161d1c8c2d3c38cdffb5ee38fd5389f798d45  ITHVNR.exe
5313a9b43d6fe54593e6bd5cc41eedf7725e8c40  ITHVNR.exp
afd80d9422586f6c294a796e3f2fd6a1b0027dc0  ITHVNR.lib
be017c19456917bfed669d00d966f3bcf5715c12  vnrhook.dll
104e176d92f8368628eff4eda9687e331b087a6c  vnrhost.dll

Tested in a fresh 32-bit prefix.

How to reproduce:
  1.  Launch wineconsole
  2.  Launch ITHVNR.exe
  3a. Click "Process"
  3b. Select wineconsole from the process list
  3c. Click "Attach"
  3d. Click "OK"

Expected result: text displayed by wineconsole is shown in ITHVNR when it's
modified (ExtTextOutW hook, second dropdown)

Actual result: wineconsole segfaults shortly after attaching (no terminal
output other than Segmentation fault)

These results can be reproduced with many 3rd-party programs too, I used
wineconsole here for easier testing since it's shipped with Wine.

The offending commit appears to be
commit 6226be3656e706d3d389cdcbf63a2ad19d861e30 
Author: Alexandre Julliard <julliard at winehq.org>
Date:   Fri Mar 27 13:36:05 2020 +0100

    ntdll: Update some string functions prototypes to match msvcrt.

    Signed-off-by: Alexandre Julliard <julliard at winehq.org>

I can't reproduce the issue on 6226be3~1, wine-5.8 with 6226be3 reverted and
wine-5.4 (last release before 6226be3). I can reproduce the bug on 6226be3,
wine-5.5, wine-5.8 and 4358ddc75fbfabdc4a4f31b4e3cc9aa1e0811d4c (current master
as of now).

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