[FFmpeg-cvslog] fftools/ffmpeg: Fix integer overflow in duration computation in seek_to_start()

[Michael Niedermayer]

ffmpeg | branch: master | Michael Niedermayer <michael at niedermayer.cc> | Sat Feb 15 22:56:18 2020 +0100| [4f4ad33d96a01d82edf56d58599017cb0ae5bfa8] | committer: Michael Niedermayer

fftools/ffmpeg: Fix integer overflow in duration computation in seek_to_start()

Fixes: signed integer overflow: -9223372036854775808 - 9223372036854775807 cannot be represented in type 'long'
Fixes: Ticket8142

Found-by: Suhwan
Reviewed-by: Paul B Mahol <onemda at gmail.com>
Signed-off-by: Michael Niedermayer <michael at niedermayer.cc>

> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=4f4ad33d96a01d82edf56d58599017cb0ae5bfa8
---

 fftools/ffmpeg.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/fftools/ffmpeg.c b/fftools/ffmpeg.c
index a43f94bef6..e5fbd479a8 100644
--- a/fftools/ffmpeg.c
+++ b/fftools/ffmpeg.c
@@ -4225,7 +4225,8 @@ static int seek_to_start(InputFile *ifile, AVFormatContext *is)
             ifile->time_base = ist->st->time_base;
         /* the total duration of the stream, max_pts - min_pts is
          * the duration of the stream without the last frame */
-        duration += ist->max_pts - ist->min_pts;
+        if (ist->max_pts > ist->min_pts && ist->max_pts - (uint64_t)ist->min_pts < INT64_MAX - duration)
+            duration += ist->max_pts - ist->min_pts;
         ifile->time_base = duration_max(duration, &ifile->duration, ist->st->time_base,
                                         ifile->time_base);
     }