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avcodec/g722: Fix multiple runtime error: left shift of negative value -1

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Fixes: 1340/clusterfuzz-testcase-minimized-4669892148068352

Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/targets/ffmpeg
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Michael Niedermayer 2017-05-05 18:14:03 +02:00
parent 38152d9368
commit f55df62998
1 changed files with 4 additions and 4 deletions
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8
libavcodec/g722.c
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@ -88,14 +88,14 @@ static inline void s_zero(int cur_diff, struct G722Band *band)
ACCUM(3, band->diff_mem[2], 1);
ACCUM(2, band->diff_mem[1], 1);
ACCUM(1, band->diff_mem[0], 1);
ACCUM(0, cur_diff << 1, 1);
ACCUM(0, cur_diff * 2, 1);
} else {
ACCUM(5, band->diff_mem[4], 0);
ACCUM(4, band->diff_mem[3], 0);
ACCUM(3, band->diff_mem[2], 0);
ACCUM(2, band->diff_mem[1], 0);
ACCUM(1, band->diff_mem[0], 0);
ACCUM(0, cur_diff << 1, 0);
ACCUM(0, cur_diff * 2, 0);
}
#undef ACCUM
band->s_zero = s_zero;
@ -119,14 +119,14 @@ static void do_adaptive_prediction(struct G722Band *band, const int cur_diff)
band->part_reconst_mem[0] = cur_part_reconst;
band->pole_mem[1] = av_clip((sg[0] * av_clip(band->pole_mem[0], -8191, 8191) >> 5) +
(sg[1] << 7) + (band->pole_mem[1] * 127 >> 7), -12288, 12288);
(sg[1] * 128) + (band->pole_mem[1] * 127 >> 7), -12288, 12288);
limit = 15360 - band->pole_mem[1];
band->pole_mem[0] = av_clip(-192 * sg[0] + (band->pole_mem[0] * 255 >> 8), -limit, limit);
s_zero(cur_diff, band);
cur_qtzd_reconst = av_clip_int16((band->s_predictor + cur_diff) << 1);
cur_qtzd_reconst = av_clip_int16((band->s_predictor + cur_diff) * 2);
band->s_predictor = av_clip_int16(band->s_zero +
(band->pole_mem[0] * cur_qtzd_reconst >> 15) +
(band->pole_mem[1] * band->prev_qtzd_reconst >> 15));