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lavf: fix arithmetic overflows in avformat_seek_file()

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The values compared here can be more than INT64_MAX apart.  Since the
difference is always positive, converting to uint64_t before subtracting
gives the correct result without overflows.

Signed-off-by: Mans Rullgard <mans@mansr.com>
This commit is contained in:
Mans Rullgard 2012-12-07 13:53:56 +00:00
parent 6a1aa5cb26
commit 91ac403b13
1 changed files with 1 additions and 1 deletions
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2
libavformat/utils.c
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@ -1762,7 +1762,7 @@ int avformat_seek_file(AVFormatContext *s, int stream_index, int64_t min_ts, int
//Fallback to old API if new is not implemented but old is
//Note the old has somewat different sematics
if(s->iformat->read_seek || 1)
return av_seek_frame(s, stream_index, ts, flags | (ts - min_ts > (uint64_t)(max_ts - ts) ? AVSEEK_FLAG_BACKWARD : 0));
return av_seek_frame(s, stream_index, ts, flags | ((uint64_t)ts - min_ts > (uint64_t)max_ts - ts ? AVSEEK_FLAG_BACKWARD : 0));
// try some generic seek like seek_frame_generic() but with new ts semantics
}