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avcodec/mjpegdec: Fix DC overflow in decode_block()

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Fixes Ticket4683

Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Michael Niedermayer 2015-07-15 04:59:35 +02:00
parent 90dd6ad22c
commit dffae122d0
1 changed files with 1 additions and 0 deletions
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libavcodec/mjpegdec.c
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@ -672,6 +672,7 @@ static int decode_block(MJpegDecodeContext *s, int16_t *block, int component,
return AVERROR_INVALIDDATA;
}
val = val * quant_matrix[0] + s->last_dc[component];
val = FFMIN(val, 32767);
s->last_dc[component] = val;
block[0] = val;
/* AC coefs */