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avcodec/mjpegdec: Fix DC overflow in decode_block()
Fixes Ticket4683 Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
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@ -672,6 +672,7 @@ static int decode_block(MJpegDecodeContext *s, int16_t *block, int component,
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return AVERROR_INVALIDDATA;
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return AVERROR_INVALIDDATA;
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}
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}
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val = val * quant_matrix[0] + s->last_dc[component];
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val = val * quant_matrix[0] + s->last_dc[component];
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val = FFMIN(val, 32767);
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s->last_dc[component] = val;
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s->last_dc[component] = val;
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block[0] = val;
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block[0] = val;
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/* AC coefs */
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/* AC coefs */
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