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avcodec/adpcm: Fix invalid shifts in ADPCM DTK

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Fixes: left shift of negative value -1
Fixes: 18397/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_ADPCM_DTK_fuzzer-5675653487132672

Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Reviewed-by: Paul B Mahol <onemda@gmail.com>
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Michael Niedermayer 2019-10-27 23:38:47 +01:00
parent f17ea02001
commit 34e701ff93
1 changed files with 1 additions and 1 deletions
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libavcodec/adpcm.c
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@ -1723,7 +1723,7 @@ static int adpcm_decode_frame(AVCodecContext *avctx, void *data,
else
sampledat = sign_extend(byte >> 4, 4);
sampledat = (((sampledat << 12) >> (header & 0xf)) << 6) + prev;
sampledat = ((sampledat * (1 << 12)) >> (header & 0xf)) * (1 << 6) + prev;
*samples++ = av_clip_int16(sampledat >> 6);
c->status[channel].sample2 = c->status[channel].sample1;
c->status[channel].sample1 = sampledat;