[FFmpeg-devel] [PATCH 1/4] avcodec/qdm2: Check fft_coefs_index

[Paul B Mahol]

lgtm

On 2/19/20, Michael Niedermayer <michael at niedermayer.cc> wrote:
> Fixes: out of array access
> Fixes:
> 20660/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_QDM2_fuzzer-5658290216501248
>
> 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/qdm2.c | 3 +++
>  1 file changed, 3 insertions(+)
>
> diff --git a/libavcodec/qdm2.c b/libavcodec/qdm2.c
> index 7b9d50b234..657b2da64d 100644
> --- a/libavcodec/qdm2.c
> +++ b/libavcodec/qdm2.c
> @@ -1334,6 +1334,9 @@ static void qdm2_fft_decode_tones(QDM2Context *q, int
> duration,
>          if (q->frequency_range > (local_int_14 + 1)) {
>              int sub_packet = (local_int_20 + local_int_28);
>
> +            if (q->fft_coefs_index + stereo >=
> FF_ARRAY_ELEMS(q->fft_coefs))
> +                return;
> +
>              qdm2_fft_init_coefficient(q, sub_packet, offset, duration,
>                                        channel, exp, phase);
>              if (stereo)
> --
> 2.17.1
>
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