Fixes: runtime error: signed integer overflow: -1440457022 - 785819492 cannot be represented in type 'int'
Fixes: 7700/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_OPUS_fuzzer-6595838684954624
Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
/* reconstruct A(z) */
for (k = 0; k < order>>1; k++) {
- lpc32[k] = -p[k + 1] - p[k] - q[k + 1] + q[k];
- lpc32[order-k-1] = -p[k + 1] - p[k] + q[k + 1] - q[k];
+ int32_t p_tmp = p[k + 1] + p[k];
+ int32_t q_tmp = q[k + 1] - q[k];
+ lpc32[k] = -q_tmp - p_tmp;
+ lpc32[order-k-1] = q_tmp - p_tmp;
}
/* limit the range of the LPC coefficients to each fit within an int16_t */