[FFmpeg-cvslog] avformat/mvdec: Check sample rate in parse_audio_var()

[Michael Niedermayer]

ffmpeg | branch: release/4.4 | Michael Niedermayer <michael at niedermayer.cc> | Wed Apr 28 16:44:13 2021 +0200| [5f0c0883c25f398ef23cfbbe82bdd13bb3e3c799] | committer: Michael Niedermayer

avformat/mvdec: Check sample rate in parse_audio_var()

Fixes: signed integer overflow: -635424002382840000 * 16 cannot be represented in type 'long'
Fixes: 33612/clusterfuzz-testcase-minimized-ffmpeg_dem_MV_fuzzer-5704741108711424

Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Reviewed-by: Peter Ross <pross at xvid.org>
Signed-off-by: Michael Niedermayer <michael at niedermayer.cc>
(cherry picked from commit 0ff60249a57cba00ab679ca6190a802cc0c7b9c7)
Signed-off-by: Michael Niedermayer <michael at niedermayer.cc>

> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=5f0c0883c25f398ef23cfbbe82bdd13bb3e3c799
---

 libavformat/mvdec.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/libavformat/mvdec.c b/libavformat/mvdec.c
index 045c66ac3c..b833abfa19 100644
--- a/libavformat/mvdec.c
+++ b/libavformat/mvdec.c
@@ -157,6 +157,8 @@ static int parse_audio_var(AVFormatContext *avctx, AVStream *st,
         return set_channels(avctx, st, var_read_int(pb, size));
     } else if (!strcmp(name, "SAMPLE_RATE")) {
         st->codecpar->sample_rate = var_read_int(pb, size);
+        if (st->codecpar->sample_rate <= 0)
+            return AVERROR_INVALIDDATA;
         avpriv_set_pts_info(st, 33, 1, st->codecpar->sample_rate);
     } else if (!strcmp(name, "SAMPLE_WIDTH")) {
         uint64_t bpc = var_read_int(pb, size) * (uint64_t)8;