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avcodec/adpcm: Fix undefined behavior with negative predictions in IMA OKI 

Fixes: left shift of negative value -30
Fixes: 18392/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_ADPCM_IMA_OKI_fuzzer-5631771831435264

Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Michael Niedermayer 2019-10-25 11:12:02 +02:00
parent 1c63edcdd2
commit 7786f6c30e
1 changed files with 1 additions and 1 deletions
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libavcodec/adpcm.c
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@ -342,7 +342,7 @@ static inline int16_t adpcm_ima_oki_expand_nibble(ADPCMChannelStatus *c, int nib
c->predictor = av_clip_intp2(predictor, 11);
c->step_index = step_index;
return c->predictor << 4;
return c->predictor * 16;
}
static inline int16_t adpcm_ct_expand_nibble(ADPCMChannelStatus *c, int8_t nibble)