Fix security issue CVE-2015-0295

[taken from RedHat Qt3 patches]
(cherry picked from commit b3037160f2)
r14.0.x
Slávek Banko 10 years ago
parent 5184b53b9b
commit a0008cd747

@ -4716,10 +4716,16 @@ bool read_dib( QDataStream& s, int offset, int startpos, QImage& image )
if ( (Q_ULONG)d->readBlock( (char *)&blue_mask, sizeof(blue_mask) ) != sizeof(blue_mask) )
return FALSE;
red_shift = calc_shift(red_mask);
if (((red_mask >> red_shift) + 1) == 0)
return FALSE;
red_scale = 256 / ((red_mask >> red_shift) + 1);
green_shift = calc_shift(green_mask);
if (((green_mask >> green_shift) + 1) == 0)
return FALSE;
green_scale = 256 / ((green_mask >> green_shift) + 1);
blue_shift = calc_shift(blue_mask);
if (((blue_mask >> blue_shift) + 1) == 0)
return FALSE;
blue_scale = 256 / ((blue_mask >> blue_shift) + 1);
} else if (comp == BMP_RGB && (nbits == 24 || nbits == 32)) {
blue_mask = 0x000000ff;

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