[FFmpeg-devel] [PATCH 1/2] avcodec/sonic: Fix several integer overflows

[Paul B Mahol]

NAK

This code should be purged from the tree.

On 2/21/20, Michael Niedermayer <michael at niedermayer.cc> wrote:
> Fixes: signed integer overflow: 2129689466 + 2129689466 cannot be
> represented in type 'int'
> Fixes:
> 20715/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_SONIC_fuzzer-5155263109922816
>
> 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/sonic.c | 7 ++++---
>  1 file changed, 4 insertions(+), 3 deletions(-)
>
> diff --git a/libavcodec/sonic.c b/libavcodec/sonic.c
> index c975774b04..b82c44344c 100644
> --- a/libavcodec/sonic.c
> +++ b/libavcodec/sonic.c
> @@ -140,7 +140,8 @@ static inline av_flatten int get_symbol(RangeCoder *c,
> uint8_t *state, int is_si
>      if(get_rac(c, state+0))
>          return 0;
>      else{
> -        int i, e, a;
> +        int i, e;
> +        unsigned a;
>          e= 0;
>          while(get_rac(c, state+1 + FFMIN(e,9))){ //1..10
>              e++;
> @@ -474,7 +475,7 @@ static int predictor_calc_error(int *k, int *state, int
> order, int error)
>      for (i = order-2; i >= 0; i--, k_ptr--, state_ptr--)
>      {
>          int k_value = *k_ptr, state_value = *state_ptr;
> -        x -= shift_down(k_value * state_value, LATTICE_SHIFT);
> +        x -= shift_down(k_value * (unsigned)state_value, LATTICE_SHIFT);
>          state_ptr[1] = state_value + shift_down(k_value * (unsigned)x,
> LATTICE_SHIFT);
>      }
>  #else
> @@ -1044,7 +1045,7 @@ static int sonic_decode_frame(AVCodecContext *avctx,
>                  x += s->channels;
>              }
>
> -            s->int_samples[x] = predictor_calc_error(s->predictor_k,
> s->predictor_state[ch], s->num_taps, s->coded_samples[ch][i] * quant);
> +            s->int_samples[x] = predictor_calc_error(s->predictor_k,
> s->predictor_state[ch], s->num_taps, s->coded_samples[ch][i] *
> (unsigned)quant);
>              x += s->channels;
>          }
>
> --
> 2.17.1
>
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