[FFmpeg-cvslog] avformat/iamf_parse: reject ambisonics mode > 1

[Michael Niedermayer]

ffmpeg | branch: master | Michael Niedermayer <michael at niedermayer.cc> | Fri Nov 29 02:28:18 2024 +0100| [4cc1495aca45445181a107a682c32cfe31459929] | committer: Michael Niedermayer

avformat/iamf_parse: reject ambisonics mode > 1

ambisonics mode > 1 does not initialize any layer but layer 0
is unconditionally dereferenced

Fixes: poc-2024-11
Fixes: null pointer dereference
Found-by: 苏童 <220235212 at seu.edu.cn>
Signed-off-by: Michael Niedermayer <michael at niedermayer.cc>

> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=4cc1495aca45445181a107a682c32cfe31459929
---

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

diff --git a/libavformat/iamf_parse.c b/libavformat/iamf_parse.c
index 4aed894796..1e1de167e6 100644
--- a/libavformat/iamf_parse.c
+++ b/libavformat/iamf_parse.c
@@ -413,7 +413,7 @@ static int ambisonics_config(void *s, AVIOContext *pb,
 
     ambisonics_mode = ffio_read_leb(pb);
     if (ambisonics_mode > 1)
-        return 0;
+        return AVERROR_INVALIDDATA;
 
     output_channel_count = avio_r8(pb);  // C
     substream_count = avio_r8(pb);  // N