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avcodec/dstdec: Replace AC overread check by sample rate check 

Real files do skip coding 0 bits at the end, thus this kind of check
does not work reliable.

Fixes: Ticket 8770
Fixes: dst-256fs44-6ch-refdstencoder.dff

The samplerate is specified in ISO/IEC 14496-3:2005(E) as one of 3 fixed
values, this also can be used to limit the duration and avoid the timeout

This reverts commit f6df99dba1.

(cherry picked from commit 1679f23beb)
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Michael Niedermayer 2020-07-01 21:27:23 +02:00
parent 6536090792
commit 2b7c0ae67c
1 changed files with 6 additions and 0 deletions
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6
libavcodec/dstdec.c
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@ -85,6 +85,12 @@ static av_cold int decode_init(AVCodecContext *avctx)
return AVERROR_PATCHWELCOME;
}
// the sample rate is only allowed to be 64,128,256 * 44100 by ISO/IEC 14496-3:2005(E)
// We are a bit more tolerant here, but this check is needed to bound the size and duration
if (avctx->sample_rate > 512 * 44100)
return AVERROR_INVALIDDATA;
if (DST_SAMPLES_PER_FRAME(avctx->sample_rate) & 7) {
return AVERROR_PATCHWELCOME;
}