[FFmpeg-devel] [PATCH] avformat/iamf_parse: add missing padding to AAC extradata

[Michael Niedermayer]

On Mon, Jun 17, 2024 at 09:49:01PM -0300, James Almer wrote:
> Fixes: out of array access
> Fixes: 68863/clusterfuzz-testcase-minimized-ffmpeg_dem_IAMF_fuzzer-4833546039525376
> 
> Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
> Signed-off-by: James Almer <jamrial at gmail.com>
> ---
>  libavformat/iamf_parse.c | 5 ++++-
>  1 file changed, 4 insertions(+), 1 deletion(-)
> 
> diff --git a/libavformat/iamf_parse.c b/libavformat/iamf_parse.c
> index 312090b247..ff1b6cc75b 100644
> --- a/libavformat/iamf_parse.c
> +++ b/libavformat/iamf_parse.c
> @@ -92,13 +92,16 @@ static int aac_decoder_config(IAMFCodecConfig *codec_config,
>      if (left <= 0)
>          return AVERROR_INVALIDDATA;
>  
> -    codec_config->extradata = av_malloc(left);
> +    // We pad extradata here because avpriv_mpeg4audio_get_config2() needs it.
> +    codec_config->extradata = av_malloc(left + AV_INPUT_BUFFER_PADDING_SIZE);

can this overflow ?

except that, it fixes the testcase

thx

[...]
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Michael     GnuPG fingerprint: 9FF2128B147EF6730BADF133611EC787040B0FAB

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