[Bug 52191] Null pointer dereference in MPEG3_StreamConvert

[WineHQ Bugzilla]

https://bugs.winehq.org/show_bug.cgi?id=52191

--- Comment #4 from Hendi <hendi48 at freenet.de> ---
(In reply to Nikolay Sivov from comment #1)
> No, this looks accurate. The issue seems to be about having two functions
> variants, one in lfs_wrap.c and actual implementation in libmpg123.c. The
> wrapper does not check for null pointer, while implementation does.
> 
> It could a configuration issue, or a difference in win32 build. Maybe
> libmpg123 devs would be open to patching lfs_wrap.c accordingly.

Oh that makes total sense now, I didn't see the wrapper. I'll file a bug report
with libmpg123, surely they'll be willing to fix that deviation in behavior.

(In reply to Zebediah Figura from comment #3)
> FWIW, for reproduction purposes, it'd be nice to have the name of a specific
> application broken by this.

The application in question is an old version of MapleStory. Getting it to run
is a bit involved, which is why I didn't say anything initially.

1. Go to https://msdl.xyz/pages/gms/setups and download GMSSetupv83.exe and
install the game.
2. Download GMSv83.exe from
https://mega.nz/file/5TR1hazB#aCWUpgiIJmSWKsjP0x0khKzY_tLcNOu7YDtTGPUcAz0 and
place it in the game folder.
3. Run this in a shell to host a mock server (openbsd-netcat assumed): while
true; do echo -e
"\x0E\x00\x53\x00\x01\x00\x31\x12\x34\x56\x78\x12\x34\x56\x78\x08" | nc -l
127.0.0.1 8484; done
4. Launch GMSv83.exe.
5. Press ALT+Enter to switch to windowed mode.
6. Let it sit at the login screen, do not attempt to do anything else. It's a
bit undeterministic when execution will reach the seek, on my test machine it
usually happens after 2-10 minutes.
7. After crashing the game will write an exception trace in
drive_c/windows/syswow64/msexcr.ini if you'd like to look at that.

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