[FFmpeg-cvslog] avformat/utils: Fix integer overflow in discontinuity check

[Michael Niedermayer]

ffmpeg | branch: release/2.8 | Michael Niedermayer <michael at niedermayer.cc> | Fri Oct 12 03:00:32 2018 +0200| [6ce3fee455d66c2a51f9a5551a9356efde28e193] | committer: Michael Niedermayer

avformat/utils: Fix integer overflow in discontinuity check

Fixes: signed integer overflow: 7738135736989908991 - -7954308516317364223 cannot be represented in type 'long'
Fixes: find_stream_info_usan

Reported-by: Thomas Guilbert <tguilbert at google.com>
Signed-off-by: Michael Niedermayer <michael at niedermayer.cc>
(cherry picked from commit 4e19cfcfa3944fe4cf97bea758f72f104dcaebad)
Signed-off-by: Michael Niedermayer <michael at niedermayer.cc>

> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=6ce3fee455d66c2a51f9a5551a9356efde28e193
---

 libavformat/utils.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/libavformat/utils.c b/libavformat/utils.c
index c228bc90dc..fa4b06ffd6 100644
--- a/libavformat/utils.c
+++ b/libavformat/utils.c
@@ -3326,7 +3326,7 @@ int avformat_find_stream_info(AVFormatContext *ic, AVDictionary **options)
              * sequence, we treat it as a discontinuity. */
             if (st->info->fps_last_dts != AV_NOPTS_VALUE &&
                 st->info->fps_last_dts_idx > st->info->fps_first_dts_idx &&
-                (pkt->dts - st->info->fps_last_dts) / 1000 >
+                (pkt->dts - (uint64_t)st->info->fps_last_dts) / 1000 >
                 (st->info->fps_last_dts     - (uint64_t)st->info->fps_first_dts) /
                 (st->info->fps_last_dts_idx - st->info->fps_first_dts_idx)) {
                 av_log(ic, AV_LOG_WARNING,