[FFmpeg-devel] [PATCH 3/3] avformat/iamf_parse: check space left for AAC

From: Michael Niedermayer <michael@niedermayer.cc>
To: FFmpeg development discussions and patches <ffmpeg-devel@ffmpeg.org>
Subject: [FFmpeg-devel] [PATCH 3/3] avformat/iamf_parse: check space left for AAC
Date: Sat, 10 May 2025 16:36:08 +0200
Message-ID: <20250510143608.2309616-3-michael@niedermayer.cc> (raw)
In-Reply-To: <20250510143608.2309616-1-michael@niedermayer.cc>

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@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 abedfdb0668..37fb25962c4 100644
--- a/libavformat/iamf_parse.c
+++ b/libavformat/iamf_parse.c
@@ -304,6 +304,8 @@ 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;
         put_bits(&pb, ret, get_bits_long(&gb, ret));
         flush_put_bits(&pb);
 
-- 
2.49.0

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