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

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Fixes: 705/clusterfuzz-testcase-5129572590813184

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 2017-03-03 04:39:04 +01:00
parent eb41956636
commit d23727e042
1 changed files with 1 additions and 1 deletions
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2
libavcodec/adxdec.c
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@ -81,7 +81,7 @@ static int adx_decode(ADXContext *c, int16_t *out, int offset,
s2 = prev->s2;
for (i = 0; i < BLOCK_SAMPLES; i++) {
d = get_sbits(&gb, 4);
s0 = ((d << COEFF_BITS) * scale + c->coeff[0] * s1 + c->coeff[1] * s2) >> COEFF_BITS;
s0 = ((d * (1 << COEFF_BITS)) * scale + c->coeff[0] * s1 + c->coeff[1] * s2) >> COEFF_BITS;
s2 = s1;
s1 = av_clip_int16(s0);
*out++ = s1;