[MPlayer-dev-eng] Recent regression in FreeMediaType

Zuxy Meng zuxy.meng at gmail.com
Mon Apr 9 16:57:42 CEST 2007


2007/3/14, Alan Nisota <alannisota at gmail.com>:
> The changes to how AM_MEDIA_TYPE is handled about 2 weeks ago seems to
> be a bit broken.
> Specifically, in FreeMediaType, this code:
>     if (pMediaType->pUnk)
>     {
>         pMediaType->pUnk->vt->Release(pMediaType->pUnk);
>         pMediaType->pUnk = NULL;
>     }
> (well the 'Release') causes a segfault with CoreAVC (gdb reports
> pUnk->vt as inaccessible memory).  I believe this data has already been
> released (but pUnk not zeroed) by the time this gets called
> (MemAllocator_Decommit) though I haven't dug into it much.
> All I know so far is it didn't used to segfault on termination before
> the patch was applied.
> I'll try to collect more info, and I realize that as CoreAVC isn't a
> supported codec, I'm on my own, but I figured I'd report it nonetheless.

Reproducible with wmv8 too. Disabling the Release statement avoids
SIGSEV. Another blocker for RC2?
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