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avcodec/wavpack: Fix runtime error: left shift of negative value -2

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Fixes: 723/clusterfuzz-testcase-6471394663596032

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 2017-03-04 04:55:15 +01:00
parent 29638d4db9
commit ba15005132
1 changed files with 2 additions and 2 deletions
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4
libavcodec/wavpack.c
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@ -745,13 +745,13 @@ static int wavpack_decode_block(AVCodecContext *avctx, int block_no,
}
for (i = 0; i < weights; i++) {
t = (int8_t)bytestream2_get_byte(&gb);
s->decorr[s->terms - i - 1].weightA = t << 3;
s->decorr[s->terms - i - 1].weightA = t * (1 << 3);
if (s->decorr[s->terms - i - 1].weightA > 0)
s->decorr[s->terms - i - 1].weightA +=
(s->decorr[s->terms - i - 1].weightA + 64) >> 7;
if (s->stereo_in) {
t = (int8_t)bytestream2_get_byte(&gb);
s->decorr[s->terms - i - 1].weightB = t << 3;
s->decorr[s->terms - i - 1].weightB = t * (1 << 3);
if (s->decorr[s->terms - i - 1].weightB > 0)
s->decorr[s->terms - i - 1].weightB +=
(s->decorr[s->terms - i - 1].weightB + 64) >> 7;