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| author | Janne Grunau <janne-libav@jannau.net> | 2012-11-23 14:05:36 +0100 |
|---|---|---|
| committer | Janne Grunau <janne-libav@jannau.net> | 2012-11-26 10:26:08 +0100 |
| commit | 7709ce029a7bc101b9ac1ceee607cda10dcb89dc (patch) | |
| tree | daab4df12a540724cddf6536b8259230bf228c85 | |
| parent | 5ae72f54532960cb9eae82a1c9e8d505106c022b (diff) | |
| download | ffmpeg-7709ce029a7bc101b9ac1ceee607cda10dcb89dc.tar.gz | |
lavf: avoid integer overflow in ff_compute_frame_duration()
Scaling the denominator instead of the numerator if it is too large
loses precision. Fixes an assert caused by a negative frame duration in
the fuzzed sample nasa-8s2.ts_s202310.
CC: libav-stable@libav.org
| -rw-r--r-- | libavformat/utils.c | 5 |
1 files changed, 4 insertions, 1 deletions
diff --git a/libavformat/utils.c b/libavformat/utils.c index ca52469bdb..fc8b770a85 100644 --- a/libavformat/utils.c +++ b/libavformat/utils.c @@ -725,7 +725,10 @@ void ff_compute_frame_duration(int *pnum, int *pden, AVStream *st, *pnum = st->codec->time_base.num; *pden = st->codec->time_base.den; if (pc && pc->repeat_pict) { - *pnum = (*pnum) * (1 + pc->repeat_pict); + if (*pnum > INT_MAX / (1 + pc->repeat_pict)) + *pden /= 1 + pc->repeat_pict; + else + *pnum *= 1 + pc->repeat_pict; } //If this codec can be interlaced or progressive then we need a parser to compute duration of a packet //Thus if we have no parser in such case leave duration undefined. |