[FFmpeg-devel] [PATCH 1/4] avformat/iamf_parse: Check extradata size

[Michael Niedermayer]

Fixes: Assertion n>=0 && n<=32 failed at ./libavcodec/get_bits.h:406
Fixes: 398527871/clusterfuzz-testcase-minimized-ffmpeg_dem_IAMF_fuzzer-6602025714647040

Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Signed-off-by: Michael Niedermayer <michael at niedermayer.cc>
---
 libavformat/iamf_parse.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/libavformat/iamf_parse.c b/libavformat/iamf_parse.c
index 71497876ac3..330e01733dd 100644
--- a/libavformat/iamf_parse.c
+++ b/libavformat/iamf_parse.c
@@ -305,6 +305,8 @@ static int update_extradata(AVCodecParameters *codecpar)
         skip_bits(&gb, 4);
         put_bits(&pb, 4, codecpar->ch_layout.nb_channels); // set channel config
         ret = put_bits_left(&pb);
+        if (ret < 0)
+            return AVERROR_INVALIDDATA;
         while (ret >= 32) {
            put_bits32(&pb, get_bits_long(&gb, 32));
            ret -= 32;
-- 
2.49.0