#1754 closed defect
ALL: Valgrind warning in vorbis.cpp
| Reported by: | eriktorbjorn | Owned by: | |
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| Priority: | normal | Component: | Audio |
| Version: | Keywords: | ||
| Cc: | Game: |
Description
My computer isn't fast enough to debug Valgrind warnings in code that I'm not familiar with. I got this one from starting Monkey Island 1 with Ogg Vorbis-encoded CD tracks with an August 3 CVS ScummVM snapshot:
==27572== Invalid read of size 4 ==27572== at 0x34173EA3: ov_time_seek (in /usr/lib/libvorbisfile.so.3.1.0) ==27572== by 0x81C0C9F: VorbisTrackInfo::play(SoundMixer*, PlayingSoundHandle*, int, int) (vorbis.cpp:177) ==27572== by 0x81B55DF: AudioCDManager::play(int, int, int, int) (audiocd.cpp:82) ==27572== by 0x806875A: Scumm::Sound::playCDTrack(int, int, int, int) (singleton.h:41) ==27572== Address 0x34CF0A80 is not stack'd, malloc'd or (recently) free'd
It could, of course, be a bug in ov_time_seek() itself.
Ticket imported from: #1022264. Ticket imported from: bugs/1754.
Attachments (1)
Change History (13)
comment:1 by , 20 years ago
comment:2 by , 20 years ago
On a cursory glance, there seems to be nothing "obvious" wrong with that code. Maybe a value of startFrame is passed in which is too big (or even negative?)... impossible for me to comment since I don't have Valgrind. I tried briefly with libgmalloc, which allows me to catch many OOB accesses, but nothing turned up when I just tried with loomcd. Maybe it's MICD specific, but my MICD tracks are MP3 encoded. I could re-rip them as OGG of course, but frankly don't have the time for that right now (and am leaving for a 2 week vacation soon).
comment:3 by , 20 years ago
I don't have Valgrind on the computer I'm using at the moment, unfortunately, so I can't try it with Loom CD right now. But the startFrame at the beginning of the MICD intro was 0, which seems sensible enough.
Anyway, since it's not crashing I don't consider it serious. I just filed the bug report to make sure I wouldn't forget it. (Much like the memory leak bug report that you've already fixed, actually. :-)
comment:4 by , 20 years ago
| Summary: | Valgrind warning in vorbis.cpp → ALL: Valgrind warning in vorbis.cpp |
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comment:5 by , 20 years ago
I have noticed the exact same valgrind warning when using another game with ogg for CD tracks for a long time too. I always assumed the issue was in library itself, rather than ScummVM though.
comment:6 by , 20 years ago
Not sure if it will help much, but I attached recent Valgrind log with gdb back trace when invalid read occurs.
comment:7 by , 20 years ago
So, any news on this? Maybe there are some small apps using the Ogg Vorbis libs, which we could valgrind, too, to find out whether the bug is on their side or ours (in the former case, we might want to file a bug report with the OV devs).
comment:8 by , 20 years ago
| Status: | new → closed |
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comment:10 by , 6 years ago
| Component: | --Unset-- → Audio |
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Gah, I meant a *September* 3 CVS snapshot, of course.