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avformat/oggparsetheora: clip duration within 64bit

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Fixes: signed integer overflow: 9079256848778919936 - -288230376151711746 cannot be represented in type 'long'
Fixes: 58248/clusterfuzz-testcase-minimized-ffmpeg_dem_OGG_fuzzer-6326851353313280

Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
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Michael Niedermayer 2023-05-02 01:46:31 +02:00
parent b168aeb734
commit b1c3d81e71
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1 changed files with 1 additions and 1 deletions
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libavformat/oggparsetheora.c
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@ -196,7 +196,7 @@ static int theora_packet(AVFormatContext *s, int idx)
if(s->streams[idx]->start_time == AV_NOPTS_VALUE && os->lastpts != AV_NOPTS_VALUE) {
s->streams[idx]->start_time = os->lastpts;
if (s->streams[idx]->duration > 0)
s->streams[idx]->duration -= s->streams[idx]->start_time;
s->streams[idx]->duration = av_sat_sub64(s->streams[idx]->duration, s->streams[idx]->start_time);
}
}