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avcodec/sonic: Fix several integer overflows

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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@niedermayer.cc>
(cherry picked from commit 75d520e337)
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Michael Niedermayer 2020-02-20 19:56:39 +01:00
parent 6011484167
commit 2ce670fc48
1 changed files with 4 additions and 3 deletions
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7
libavcodec/sonic.c
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@ -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;
}