[Bug 12044] Garry's mod crashes upon player death caused by prop.

[wine-bugs at winehq.org]

http://bugs.winehq.org/show_bug.cgi?id=12044

--- Comment #40 from Sam Edwards <CFSworks at gmail.com> 2012-02-21 19:45:56 CST ---
I'm now 90% certain that this is the same as bug 7698...

Turning on Windows 98 mode fixed the problem. After a little
reverse-engineering, I found that Source uses GetGlyphOutlineA where available,
and falls back to ExtTextOutA when GetGlyphOutlineA fails. I turned Windows 98
mode back off and modified GetGlyphOutline* to return GDI_ERROR
unconditionally, and the crash went away!

The difference between this and bug 7698 is that this crash occurs immediately,
while 7698 takes some time before it dies. My explanation for this is that
Garry's Mod renders its killicons from a Lua function, and so the call stack is
far different from pure-Source, and Garry's Mod's stack is far more sensitive
to buffer overflows while rendering a font glyph. When this happens in other
games, it probably just corrupts a little bit of memory each time until the
game finally crashes.

I'm going to try loading some Counter-Strike Source killicons in GMod and see
which ones cause crashes. We should then know for sure if my guess is correct.

If anybody wants to help reverse-engineer this, the culprit function is located
in vguimatsurface.dll. Look for the subroutine that calls GetGlyphOutlineA
(there is only one). For me the entry point is located at 0x1001A7B0.

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