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avutil/timecode: Avoid fps overflow

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Fixes: Integer overflow and division by 0
Fixes: poc-202102-div.mov

Found-by: 1vanChen of NSFOCUS Security Team
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
(cherry picked from commit c94875471e3ba3dc396c6919ff3ec9b14539cd71)
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Michael Niedermayer 2021-03-01 13:44:12 +01:00
parent c09a3b10cd
commit f3a82afec9
1 changed files with 2 additions and 2 deletions
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4
libavutil/timecode.c
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@ -96,8 +96,8 @@ char *av_timecode_make_string(const AVTimecode *tc, char *buf, int framenum)
}
ff = framenum % fps;
ss = framenum / fps % 60;
mm = framenum / (fps*60) % 60;
hh = framenum / (fps*3600);
mm = framenum / (fps*60LL) % 60;
hh = framenum / (fps*3600LL);
if (tc->flags & AV_TIMECODE_FLAG_24HOURSMAX)
hh = hh % 24;
snprintf(buf, AV_TIMECODE_STR_SIZE, "%s%02d:%02d:%02d%c%02d",