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avformat/flvdec: Use av_sat_add64() for pts computation

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Fixes: signed integer overflow: -9223372036854767583 + -65536 cannot be represented in type 'long'
Fixes: 26910/clusterfuzz-testcase-minimized-ffmpeg_dem_FLV_fuzzer-6734549467922432

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 2021-01-14 22:02:50 +01:00
parent d82ee907d6
commit 7a6666b19d
1 changed files with 1 additions and 1 deletions
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2
libavformat/flvdec.c
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@ -1231,7 +1231,7 @@ retry_duration:
if (st->codecpar->codec_id == AV_CODEC_ID_H264 || st->codecpar->codec_id == AV_CODEC_ID_MPEG4) {
// sign extension
int32_t cts = (avio_rb24(s->pb) + 0xff800000) ^ 0xff800000;
pts = dts + cts;
pts = av_sat_add64(dts, cts);
if (cts < 0) { // dts might be wrong
if (!flv->wrong_dts)
av_log(s, AV_LOG_WARNING,