[Bug 48700] Wolcen: Lords of Mayhem - there's a blob around the character's head.

[WineHQ Bugzilla]

https://bugs.winehq.org/show_bug.cgi?id=48700

Paul Gofman <gofmanp at gmail.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |gofmanp at gmail.com

--- Comment #3 from Paul Gofman <gofmanp at gmail.com> ---
Created attachment 66590
  --> https://bugs.winehq.org/attachment.cgi?id=66590
POC patch (introduces memory leak by refusing to free small memory blocks)

I've tested the game. 

The game seems to do good old use after free on some pointers. The attached
proof of concept tweak fixes the issues for me (tested on initial character
creation screen only). Please note that the patch just skips the free of small
sized memory blocks and thus introduces stable memory leak.

This doesn't look like something triggered by Wine specifics as exactly the
same graphical issue is reproducible on Windows if to run program with Windows
debug heap. E. g., if the program is started from any debugger, the same glitch
is in place. If to set _NO_DEBUG_HEAP environment variable the glitch is not
there even if the program is started from debugger, so it looks like it is
debug heap that makes the difference on Windows.

The problem doesn't look fixable under Wine, Wine heap implementation is
different from Windows in details and Wine is unlikely going to ever reproduce
the Windows heap layout and allocate / free algorithms exactly.

Maybe game developers would fix the use after free in game, as it is something
I guess they definitely want to fix even if this happens to work now on
currently supported Windows versions. I suppose running the program under
something like Valgrind or just build with MSVC debug heap would immediately
reproduce the glitch and possibly allow to pinpoint use after free location.

-- 
Do not reply to this email, post in Bugzilla using the
above URL to reply.
You are receiving this mail because:
You are watching all bug changes.