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avformat/utils: Check dts - (1<<pts_wrap_bits) overflow

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Fixes: signed integer overflow: -9223372036842389247 - 2147483648 cannot be represented in type 'long long'
Fixes: 26910/clusterfuzz-testcase-minimized-ffmpeg_dem_FLV_fuzzer-4845007531671552

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 21:29:01 +01:00
parent 638a151a87
commit d82ee907d6
1 changed files with 1 additions and 1 deletions
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libavformat/utils.c
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@ -1254,7 +1254,7 @@ static void compute_pkt_fields(AVFormatContext *s, AVStream *st,
presentation_delayed = 1;
if (pkt->pts != AV_NOPTS_VALUE && pkt->dts != AV_NOPTS_VALUE &&
st->pts_wrap_bits < 63 &&
st->pts_wrap_bits < 63 && pkt->dts > INT64_MIN + (1LL << (st->pts_wrap_bits - 1)) &&
pkt->dts - (1LL << (st->pts_wrap_bits - 1)) > pkt->pts) {
if (is_relative(st->cur_dts) || pkt->dts - (1LL<<(st->pts_wrap_bits - 1)) > st->cur_dts) {
pkt->dts -= 1LL << st->pts_wrap_bits;