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Fix out of buffer access in qt_qimageScaleRgba64_up_xy 

Avoid reading a pixel outside the image even if we multiply the result
by 0. This mirrors a similar old fix in the the 32bit scaling path.

Change-Id: I7860bc808dc46dbc94918672e99c81b56d4a1d27
Reviewed-by: Simon Hausmann <simon.hausmann@qt.io>
bb10
Allan Sandfeld Jensen 2018-08-28 14:09:51 +02:00
parent 825e1a0506
commit 384fc28b90
1 changed files with 4 additions and 1 deletions
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5
src/gui/painting/qimagescale.cpp
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@ -564,7 +564,10 @@ static void qt_qimageScaleRgba64_up_xy(QImageScaleInfo *isi, QRgba64 *dest,
for (int x = 0; x < dw; x++) {
const QRgba64 *pix = sptr + xpoints[x];
const int xap = xapoints[x];
*dptr = interpolate256(pix[0], 256 - xap, pix[1], xap);
if (xap > 0)
*dptr = interpolate256(pix[0], 256 - xap, pix[1], xap);
else
*dptr = pix[0];
dptr++;
}
}