[FFmpeg-cvslog] avformat/mov: Check channels for mov_parse_stsd_audio()

[Michael Niedermayer]

ffmpeg | branch: release/4.3 | Michael Niedermayer <michael at niedermayer.cc> | Sun Nov  7 13:48:24 2021 +0100| [867b978dc90a8bf3dce2a76620f28d8dc7cb139a] | committer: Michael Niedermayer

avformat/mov: Check channels for mov_parse_stsd_audio()

Fixes: signed integer overflow: -776522110086937600 * 16 cannot be represented in type 'long'
Fixes: 40563/clusterfuzz-testcase-minimized-ffmpeg_dem_MOV_fuzzer-6644829447127040

Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Signed-off-by: Michael Niedermayer <michael at niedermayer.cc>
(cherry picked from commit 3a64a4c58255d45e05eff80c9464ad3bdc2d6463)
Signed-off-by: Michael Niedermayer <michael at niedermayer.cc>

> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=867b978dc90a8bf3dce2a76620f28d8dc7cb139a
---

 libavformat/mov.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/libavformat/mov.c b/libavformat/mov.c
index fa720bbb34..414918050b 100644
--- a/libavformat/mov.c
+++ b/libavformat/mov.c
@@ -2532,6 +2532,10 @@ int ff_mov_read_stsd_entries(MOVContext *c, AVIOContext *pb, int entries)
                 av_log(c->fc, AV_LOG_ERROR, "Invalid sample rate %d\n", st->codecpar->sample_rate);
                 return AVERROR_INVALIDDATA;
             }
+            if (st->codecpar->channels < 0) {
+                av_log(c->fc, AV_LOG_ERROR, "Invalid channels %d\n", st->codecpar->channels);
+                return AVERROR_INVALIDDATA;
+            }
         } else if (st->codecpar->codec_type==AVMEDIA_TYPE_SUBTITLE){
             mov_parse_stsd_subtitle(c, pb, st, sc,
                                     size - (avio_tell(pb) - start_pos));