Re: [FFmpeg-devel] [PATCH 5/5] avcodec/sonic: avoid integer overflow on quantization parameter

[Paul B Mahol <onemda@gmail.com>]

On 1/13/23, Michael Niedermayer <michael@niedermayer.cc> wrote:
> Fixes: signed integer overflow: -1094995529 * 16 cannot be represented in
> type 'int'
> Fixes:
> 48567/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_SONIC_fuzzer-6681622236233728
>
> Found-by: continuous fuzzing process
> https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
> Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
> ---
>  libavcodec/sonic.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/libavcodec/sonic.c b/libavcodec/sonic.c
> index 77bdb418a7..95ac2b1a96 100644
> --- a/libavcodec/sonic.c
> +++ b/libavcodec/sonic.c
> @@ -1013,7 +1013,7 @@ static int sonic_decode_frame(AVCodecContext *avctx,
> AVFrame *frame,
>      if (s->lossless)
>          quant = 1;
>      else
> -        quant = get_symbol(&c, state, 0) * SAMPLE_FACTOR;
> +        quant = get_symbol(&c, state, 0) * (unsigned)SAMPLE_FACTOR;
>
>  //    av_log(NULL, AV_LOG_INFO, "quant: %d\n", quant);
>
> --
> 2.17.1
>


You are pointlessly wasting resources on broken bonk clone.

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