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avformat/aqtitledec: Skip unrepresentable durations

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Fixes: signed integer overflow: -5 - 9223372036854775807 cannot be represented in type 'long'
Fixes: 45665/clusterfuzz-testcase-minimized-ffmpeg_DEMUXER_fuzzer-475618463934054

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 c2d1597a8a6470045a8da241d4f65c81f26c3107)
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Michael Niedermayer 2022-03-20 00:07:50 +01:00
parent 4d1674cccf
commit e1a5738b73
1 changed files with 2 additions and 1 deletions
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3
libavformat/aqtitledec.c
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@ -74,7 +74,8 @@ static int aqt_read_header(AVFormatContext *s)
new_event = 1;
pos = avio_tell(s->pb);
if (sub) {
sub->duration = frame - sub->pts;
if (frame >= sub->pts && (uint64_t)frame - sub->pts < INT64_MAX)
sub->duration = frame - sub->pts;
sub = NULL;
}
} else if (*line) {