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avformat/utils: Use av_sat_sub64() in max_analyze_duration check

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Fixes: signed integer overflow: 9223372036854710272 - -541165944832 cannot be represented in type 'long'
Fixes: 27000/clusterfuzz-testcase-minimized-ffmpeg_dem_IVF_fuzzer-5643670608674816

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 2020-11-10 22:27:47 +01:00
parent d03f0ec9a1
commit c6edbf0090
1 changed files with 4 additions and 2 deletions
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6
libavformat/utils.c
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@ -3864,8 +3864,10 @@ FF_ENABLE_DEPRECATION_WARNINGS
if ( t == 0
&& st->codec_info_nb_frames>30
&& st->internal->info->fps_first_dts != AV_NOPTS_VALUE
&& st->internal->info->fps_last_dts != AV_NOPTS_VALUE)
t = FFMAX(t, av_rescale_q(st->internal->info->fps_last_dts - st->internal->info->fps_first_dts, st->time_base, AV_TIME_BASE_Q));
&& st->internal->info->fps_last_dts != AV_NOPTS_VALUE) {
int64_t dur = av_sat_sub64(st->internal->info->fps_last_dts, st->internal->info->fps_first_dts);
t = FFMAX(t, av_rescale_q(dur, st->time_base, AV_TIME_BASE_Q));
}
if (analyzed_all_streams) limit = max_analyze_duration;
else if (avctx->codec_type == AVMEDIA_TYPE_SUBTITLE) limit = max_subtitle_analyze_duration;