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avformat/sdsdec: Use av_rescale() to avoid intermediate overflow in duration calculation 

Fixes: signed integer overflow: 72128794995445727 * 240 cannot be represented in type 'long'
Fixes: 50993/clusterfuzz-testcase-minimized-ffmpeg_dem_SDS_fuzzer-6628185583779840

Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Michael Niedermayer 2022-09-18 16:42:21 +02:00
parent 5f529e9147
commit aa8eb1bed0
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1 changed files with 1 additions and 1 deletions
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libavformat/sdsdec.c
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@ -112,7 +112,7 @@ static int sds_read_header(AVFormatContext *ctx)
st->codecpar->codec_type = AVMEDIA_TYPE_AUDIO;
st->codecpar->ch_layout.nb_channels = 1;
st->codecpar->sample_rate = sample_period ? 1000000000 / sample_period : 16000;
st->duration = (avio_size(pb) - 21) / (127) * s->size / 4;
st->duration = av_rescale((avio_size(pb) - 21) / 127, s->size, 4);
avpriv_set_pts_info(st, 64, 1, st->codecpar->sample_rate);