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avformat/utils: Ignore negative duration in codec_info_duration computation

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Fixes: signed integer overflow: -5994697211974418462 + -3255307777713450286 cannot be represented in type 'long'
Fixes: 35332/clusterfuzz-testcase-minimized-ffmpeg_dem_MATROSKA_fuzzer-5868035117285376

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 2021-07-03 23:02:16 +02:00
parent bbc24363f1
commit 4d81550df9
1 changed files with 1 additions and 1 deletions
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2
libavformat/utils.c
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@ -3813,7 +3813,7 @@ int avformat_find_stream_info(AVFormatContext *ic, AVDictionary **options)
av_packet_unref(pkt1);
break;
}
if (pkt->duration) {
if (pkt->duration > 0) {
if (avctx->codec_type == AVMEDIA_TYPE_SUBTITLE && pkt->pts != AV_NOPTS_VALUE && st->start_time != AV_NOPTS_VALUE && pkt->pts >= st->start_time
&& (uint64_t)pkt->pts - st->start_time < INT64_MAX
) {