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avformat/utils: Check rfps_duration_sum for overflow

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Fixes: signed integer overflow: 9151595917793558550 + 297519050751678697 cannot be represented in type 'long'
Fixes: 15496/clusterfuzz-testcase-minimized-ffmpeg_DEMUXER_fuzzer-5722866475073536

Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
(cherry picked from commit 5c46fdf305caac8bf2f270e69e60ae3d614df468)
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Michael Niedermayer 2019-07-04 23:01:19 +02:00
parent 6c821c1dee
commit b60455c715
1 changed files with 4 additions and 2 deletions
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6
libavformat/utils.c
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@ -3348,8 +3348,10 @@ int ff_rfps_add_frame(AVFormatContext *ic, AVStream *st, int64_t ts)
} }
} }
} }
st->info->duration_count++; if (st->info->rfps_duration_sum <= INT64_MAX - duration) {
st->info->rfps_duration_sum += duration; st->info->duration_count++;
st->info->rfps_duration_sum += duration;
}
if (st->info->duration_count % 10 == 0) { if (st->info->duration_count % 10 == 0) {
int n = st->info->duration_count; int n = st->info->duration_count;