[FFmpeg-cvslog] sbgdec: prevent NULL pointer access

[Andreas Cadhalpun]

ffmpeg | branch: release/3.2 | Andreas Cadhalpun <Andreas.Cadhalpun at googlemail.com> | Thu Nov 10 22:21:20 2016 +0100| [9aaddbf0efd3f9649d373a51eedc249ce1be8c83] | committer: Andreas Cadhalpun

sbgdec: prevent NULL pointer access

Reviewed-by: Josh de Kock <josh at itanimul.li>
Signed-off-by: Andreas Cadhalpun <Andreas.Cadhalpun at googlemail.com>
(cherry picked from commit dbefbb61b785cd77810c032f5cdb499d2a92df07)
Signed-off-by: Andreas Cadhalpun <Andreas.Cadhalpun at googlemail.com>

> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=9aaddbf0efd3f9649d373a51eedc249ce1be8c83
---

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

diff --git a/libavformat/sbgdec.c b/libavformat/sbgdec.c
index bb020d7..cbedd12 100644
--- a/libavformat/sbgdec.c
+++ b/libavformat/sbgdec.c
@@ -927,7 +927,7 @@ static void expand_timestamps(void *log, struct sbg_script *s)
         }
     }
     if (s->start_ts == AV_NOPTS_VALUE)
-        s->start_ts = s->opt_start_at_first ? s->tseq[0].ts.t : now;
+        s->start_ts = (s->opt_start_at_first && s->tseq) ? s->tseq[0].ts.t : now;
     s->end_ts = s->opt_duration ? s->start_ts + s->opt_duration :
                 AV_NOPTS_VALUE; /* may be overridden later by -E option */
     cur_ts = now;