[FFmpeg-cvslog] avformat/dhav: do not use zero fps

[Michael Niedermayer]

ffmpeg | branch: master | Michael Niedermayer <michael at niedermayer.cc> | Fri Sep 17 21:28:00 2021 +0200| [71b4d16bca99b5feee33ea9f4eaf2dc6e96f1ed3] | committer: Michael Niedermayer

avformat/dhav: do not use zero fps

Fixes: assertion failure
Fixes: 38332/clusterfuzz-testcase-minimized-ffmpeg_dem_DHAV_fuzzer-4522405595316224

Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
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=71b4d16bca99b5feee33ea9f4eaf2dc6e96f1ed3
---

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

diff --git a/libavformat/dhav.c b/libavformat/dhav.c
index 5ae39a2a64..f67b0b89ac 100644
--- a/libavformat/dhav.c
+++ b/libavformat/dhav.c
@@ -315,7 +315,7 @@ static int64_t get_pts(AVFormatContext *s, int stream_index)
 
         if (diff < 0)
             diff += 65535;
-        if (diff == 0)
+        if (diff == 0 && dhav->frame_rate)
             diff = av_rescale(dhav->frame_number - dst->last_frame_number, 1000, dhav->frame_rate);
         dst->pts += diff;
     } else {