[FFmpeg-cvslog] avformat/utils: Check cur_dts in update_initial_timestamps() more

[Michael Niedermayer]

ffmpeg | branch: release/2.8 | Michael Niedermayer <michael at niedermayer.cc> | Fri Apr 13 11:38:48 2018 +0200| [25ecdac8beca8978ff09da97dbd5e1bda9675253] | committer: Michael Niedermayer

avformat/utils: Check cur_dts in update_initial_timestamps() more

Fixes: runtime error: signed integer overflow: 18133149658382192 - -9223090561878065151 cannot be represented in type 'long long'
Fixes: crbug 831552

Reported-by: Matt Wolenetz <wolenetz at google.com>
Reviewed-by: Matt Wolenetz <wolenetz at google.com>
Signed-off-by: Michael Niedermayer <michael at niedermayer.cc>
(cherry picked from commit 37d46dc21d708192b12aa13617ebe6a117b07363)
Signed-off-by: Michael Niedermayer <michael at niedermayer.cc>

> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=25ecdac8beca8978ff09da97dbd5e1bda9675253
---

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

diff --git a/libavformat/utils.c b/libavformat/utils.c
index a658eb22c0..33a4aade64 100644
--- a/libavformat/utils.c
+++ b/libavformat/utils.c
@@ -894,6 +894,7 @@ static void update_initial_timestamps(AVFormatContext *s, int stream_index,
     if (st->first_dts != AV_NOPTS_VALUE ||
         dts           == AV_NOPTS_VALUE ||
         st->cur_dts   == AV_NOPTS_VALUE ||
+        st->cur_dts < INT_MIN + RELATIVE_TS_BASE ||
         is_relative(dts))
         return;