[FFmpeg-cvslog] avformat/3dostr: Check sample_rate

[Michael Niedermayer]

ffmpeg | branch: release/4.3 | Michael Niedermayer <michael at niedermayer.cc> | Mon Feb  8 14:29:02 2021 +0100| [81735671c27c9d1aa9afc22f8faa582176ef4869] | committer: Michael Niedermayer

avformat/3dostr: Check sample_rate

Fixes: signed integer overflow: -1268324762623155200 * 8 cannot be represented in type 'long'
Fixes: 30123/clusterfuzz-testcase-minimized-ffmpeg_dem_THREEDOSTR_fuzzer-6710765123928064

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>
(cherry picked from commit 7e5034f97e41d3f8112c1f8da3b5274ab99ef6f8)
Signed-off-by: Michael Niedermayer <michael at niedermayer.cc>

> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=81735671c27c9d1aa9afc22f8faa582176ef4869
---

 libavformat/3dostr.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/libavformat/3dostr.c b/libavformat/3dostr.c
index 6c49f7589c..e77df9e5c9 100644
--- a/libavformat/3dostr.c
+++ b/libavformat/3dostr.c
@@ -64,7 +64,7 @@ static int threedostr_read_header(AVFormatContext *s)
             st->codecpar->codec_type  = AVMEDIA_TYPE_AUDIO;
             st->codecpar->sample_rate = avio_rb32(s->pb);
             st->codecpar->channels    = avio_rb32(s->pb);
-            if (st->codecpar->channels <= 0)
+            if (st->codecpar->channels <= 0 || st->codecpar->sample_rate <= 0)
                 return AVERROR_INVALIDDATA;
             codec                  = avio_rl32(s->pb);
             avio_skip(s->pb, 4);