#764: Increasing robustness of runlength decoding for scantable access in
mpeg12.c
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Reporter: erik | Owner:
Type: defect | Status: new
Priority: normal | Component: avcodec
Version: unspecified | Resolution:
Keywords: mpeg | Blocked By:
robustness | Reproduced by developer: 0
Blocking: |
Analyzed by developer: 0 |
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Comment (by erik):
Yes, but it is somewhere in a 4 GByte recording. Crashing depends on OS
and memory allocation so I had great difficulty to get a reproducable
crash, any change of code or code ordering can make it disappear and come
back randomly in other corrupted recordings.
Libmpeg2 has a similar robustness precaution. There it is better
implemented. They explicitly check on values <0 or >= 64 and have a
fallback in case the runlength decoding is corrupt. My proposal is rude
but simple.
On posting on ffmpeg-devel. I hesitate to claim the status to be able to
contribute there.
--
Ticket URL: <https://ffmpeg.org/trac/ffmpeg/ticket/764#comment:2>
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