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avcodec/smacker: Fix integer overflows in pred[] in smka_decode_frame()

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Fixes: signed integer overflow: -2147481503 + -32732 cannot be represented in type 'int'
Fixes: 17782/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_SMACKAUD_fuzzer-5769672225456128

Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
(cherry picked from commit a76897e19c)
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Michael Niedermayer 2019-10-01 00:10:47 +02:00
parent 7755265387
commit a3e5542744
1 changed files with 2 additions and 2 deletions
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4
libavcodec/smacker.c
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@ -735,7 +735,7 @@ static int smka_decode_frame(AVCodecContext *avctx, void *data,
return AVERROR_INVALIDDATA;
}
val |= h[3].values[res] << 8;
pred[1] += sign_extend(val, 16);
pred[1] += (unsigned)sign_extend(val, 16);
*samples++ = pred[1];
} else {
if(vlc[0].table)
@ -756,7 +756,7 @@ static int smka_decode_frame(AVCodecContext *avctx, void *data,
return AVERROR_INVALIDDATA;
}
val |= h[1].values[res] << 8;
pred[0] += sign_extend(val, 16);
pred[0] += (unsigned)sign_extend(val, 16);
*samples++ = pred[0];
}
}