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avformat/matroskadec: fix setting channel layout using the Channels element

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If the stream's channel layout is first set into a native layout using codec
private parameters, this code here could potentially result in an invalid
native layout where popcnt(ch_layout.u.mask) != ch_layout.nb_channels being
propagated.

Fixes: Timeout printing a billion channels
Fixes: 48099/clusterfuzz-testcase-minimized-ffmpeg_dem_MATROSKA_fuzzer-6754782204788736

Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Tested-by: Michael Niedermayer <michael@niedermayer.cc>
Signed-off-by: James Almer <jamrial@gmail.com>
This commit is contained in:
James Almer 2022-07-04 14:00:21 -03:00
parent c9a2506de9
commit 94901a9518
1 changed files with 3 additions and 3 deletions
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6
libavformat/matroskadec.c
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@ -2950,10 +2950,10 @@ static int matroska_parse_tracks(AVFormatContext *s)
st->codecpar->codec_tag = fourcc;
st->codecpar->sample_rate = track->audio.out_samplerate;
// channel layout may be already set by codec private checks above
if (st->codecpar->ch_layout.order == AV_CHANNEL_ORDER_NATIVE &&
!st->codecpar->ch_layout.u.mask)
if (!av_channel_layout_check(&st->codecpar->ch_layout)) {
st->codecpar->ch_layout.order = AV_CHANNEL_ORDER_UNSPEC;
st->codecpar->ch_layout.nb_channels = track->audio.channels;
st->codecpar->ch_layout.nb_channels = track->audio.channels;
}
if (!st->codecpar->bits_per_coded_sample)
st->codecpar->bits_per_coded_sample = track->audio.bitdepth;
if (st->codecpar->codec_id == AV_CODEC_ID_MP3 ||