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avcodec/alac: Fix integer overflow in lpc_prediction() with sign
Fixes: signed integer overflow: -2147483648 * -1 cannot be represented in type 'int' Fixes: 18643/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_ALAC_fuzzer-5672182449700864 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 7686ba1f149a94c3bac235589de8aa8db92be4e5) Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
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@ -223,7 +223,7 @@ static void lpc_prediction(int32_t *error_buffer, uint32_t *buffer_out,
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val = d - pred[j];
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sign = sign_only(val) * error_sign;
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lpc_coefs[j] -= sign;
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val *= sign;
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val *= (unsigned)sign;
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error_val -= (val >> lpc_quant) * (j + 1);
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}
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}
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