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avcodec/sonic: Fix integer overflow in predictor_calc_error()
Fixes: signed integer overflow: 5 * -1094995529 cannot be represented in type 'int' Fixes: 18346/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_SONIC_fuzzer-5709623893426176 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 c8c17b8cef77dc052e8845e5fd86daf2983fd7dd) Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
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@ -473,7 +473,7 @@ static int predictor_calc_error(int *k, int *state, int order, int error)
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{
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int k_value = *k_ptr, state_value = *state_ptr;
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x -= shift_down(k_value * state_value, LATTICE_SHIFT);
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state_ptr[1] = state_value + shift_down(k_value * x, LATTICE_SHIFT);
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state_ptr[1] = state_value + shift_down(k_value * (unsigned)x, LATTICE_SHIFT);
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}
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#else
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for (i = order-2; i >= 0; i--)
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