[Bug 4209] notepad crash when using Tester Three from the MSDN Bugslayer column

https://bugs.winehq.org/show_bug.cgi?id=4209

Lauri Kenttä  changed:

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--- Comment #12 from Lauri Kenttä  ---
Created attachment 56302
  --> https://bugs.winehq.org/attachment.cgi?id=56302
Minimal test program

Since there's source code available, I isolated the problem and created a
minimal crashing example.

Steps to reproduce:

1) Compile hook.c to hook.exe (with MinGW or similar).
2) Start hook.exe in shell; optionally try also hook.exe {2|3|4}
3) Start Notepad.
4) Type a key in Notepad. It crashes right away.
5) Close hook.exe by inputting enter.

My sample program includes several versions of the hook callback. Looks like
the crash comes if the callback accesses memory at all, so practically anything
else than a simple return statement will cause a crash.

Someone with an undestanding about the Wine memory layout and/or process
boundaries should take a look at this.