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avformat/r3d: Check samples before computing duration 

Fixes: signed integer overflow: -4611686024827895807 + -4611686016279904256 cannot be represented in type 'long'
Fixes: 30161/clusterfuzz-testcase-minimized-ffmpeg_dem_R3D_fuzzer-5694406713802752

Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Reviewed-by: Paul B Mahol <onemda@gmail.com>
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Michael Niedermayer 2021-02-10 23:21:53 +01:00
parent 5314a4996c
commit 7a2aa5dc2a
1 changed files with 2 additions and 1 deletions
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libavformat/r3d.c
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@ -325,7 +325,8 @@ static int r3d_read_reda(AVFormatContext *s, AVPacket *pkt, Atom *atom)
pkt->stream_index = 1;
pkt->dts = dts;
if (st->codecpar->sample_rate)
if (st->codecpar->sample_rate && samples > 0)
pkt->duration = av_rescale(samples, st->time_base.den, st->codecpar->sample_rate);
av_log(s, AV_LOG_TRACE, "pkt dts %"PRId64" duration %"PRId64" samples %d sample rate %d\n",
pkt->dts, pkt->duration, samples, st->codecpar->sample_rate);