[FFmpeg-devel] [PATCH 1/2] avcodec/adpcm: Clip step index for ADPCM_IMA_APM

[Paul B Mahol]

lgtm

On 3/1/20, Michael Niedermayer <michael at niedermayer.cc> wrote:
> Fixes: out of array access
> Fixes:
> 20828/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_ADPCM_IMA_APM_fuzzer-5712770106654720
>
> Found-by: continuous fuzzing process
> https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
> Signed-off-by: Michael Niedermayer <michael at niedermayer.cc>
> ---
>  libavcodec/adpcm.c | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
>
> diff --git a/libavcodec/adpcm.c b/libavcodec/adpcm.c
> index b987e93c5f..5f152ee6ef 100644
> --- a/libavcodec/adpcm.c
> +++ b/libavcodec/adpcm.c
> @@ -154,9 +154,9 @@ static av_cold int adpcm_decode_init(AVCodecContext *
> avctx)
>      case AV_CODEC_ID_ADPCM_IMA_APM:
>          if (avctx->extradata && avctx->extradata_size >= 16) {
>              c->status[0].predictor  = AV_RL32(avctx->extradata +  0);
> -            c->status[0].step_index = AV_RL32(avctx->extradata +  4);
> +            c->status[0].step_index = av_clip(AV_RL32(avctx->extradata +
> 4), 0, 88);
>              c->status[1].predictor  = AV_RL32(avctx->extradata +  8);
> -            c->status[1].step_index = AV_RL32(avctx->extradata + 12);
> +            c->status[1].step_index = av_clip(AV_RL32(avctx->extradata +
> 12), 0, 88);
>          }
>          break;
>      case AV_CODEC_ID_ADPCM_IMA_WS:
> --
> 2.17.1
>
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