[FFmpeg-cvslog] avformat/genh: Check sample rate

[Michael Niedermayer]

ffmpeg | branch: release/4.2 | Michael Niedermayer <michael at niedermayer.cc> | Mon Apr 11 22:00:52 2022 +0200| [30ac63c8d2195c3ddcd2867fd607e328baa03fb0] | committer: Michael Niedermayer

avformat/genh: Check sample rate

Fixes: signed integer overflow: -2515507630940093440 * 4 cannot be represented in type 'long'
Fixes: 46318/clusterfuzz-testcase-minimized-ffmpeg_dem_GENH_fuzzer-5009637474172928

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 a3d790f1977ed6c326eb93bb61757297a7905dcc)
Signed-off-by: Michael Niedermayer <michael at niedermayer.cc>

> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=30ac63c8d2195c3ddcd2867fd607e328baa03fb0
---

 libavformat/genh.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/libavformat/genh.c b/libavformat/genh.c
index 698104a9d6..0b55a8884a 100644
--- a/libavformat/genh.c
+++ b/libavformat/genh.c
@@ -67,6 +67,9 @@ static int genh_read_header(AVFormatContext *s)
         return AVERROR_INVALIDDATA;
     st->codecpar->block_align = align * st->codecpar->channels;
     st->codecpar->sample_rate = avio_rl32(s->pb);
+    if (st->codecpar->sample_rate < 0)
+        return AVERROR_INVALIDDATA;
+
     avio_skip(s->pb, 4);
     st->duration = avio_rl32(s->pb);