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lavf: Make sure avg_frame_rate can be calculated without integer overflow

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If either of the deltas is too large for the multiplications to
succeed, don't use this for setting the avg frame rate.

Reported-by: Mateusz "j00ru" Jurczyk and Gynvael Coldwind
Cc: libav-stable@libav.org
Signed-off-by: Martin Storsjö <martin@martin.st>
This commit is contained in:
Martin Storsjö 2013-07-15 16:44:20 +03:00
parent 31931520df
commit e740929a07
1 changed files with 3 additions and 0 deletions
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3
libavformat/utils.c
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@ -2355,6 +2355,9 @@ int avformat_find_stream_info(AVFormatContext *ic, AVDictionary **options)
int best_fps = 0;
double best_error = 0.01;
if (delta_dts >= INT64_MAX / st->time_base.num ||
delta_packets >= INT64_MAX / st->time_base.den)
continue;
av_reduce(&st->avg_frame_rate.num, &st->avg_frame_rate.den,
delta_packets*(int64_t)st->time_base.den,
delta_dts*(int64_t)st->time_base.num, 60000);