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avformat/mov: use 64bit for intermediate for rounding

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Fixes: signed integer overflow: 1768972133 + 968491058 cannot be represented in type 'int'
Fixes: 62276/clusterfuzz-testcase-minimized-ffmpeg_dem_MOV_fuzzer-4802790784303104

Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
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Michael Niedermayer 2024-03-26 00:27:39 +01:00
parent 746203af31
commit f01a89c5a3
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1 changed files with 1 additions and 1 deletions
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libavformat/mov.c
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@ -8991,7 +8991,7 @@ static int mov_read_timecode_track(AVFormatContext *s, AVStream *st)
/* 60 fps content have tmcd_nb_frames set to 30 but tc_rate set to 60, so
* we multiply the frame number with the quotient.
* See tickets #9492, #9710. */
rounded_tc_rate = (tc_rate.num + tc_rate.den / 2) / tc_rate.den;
rounded_tc_rate = (tc_rate.num + tc_rate.den / 2LL) / tc_rate.den;
/* Work around files where tmcd_nb_frames is rounded down from frame rate
* instead of up. See ticket #5978. */
if (tmcd_nb_frames == tc_rate.num / tc_rate.den &&