diff --git a/src/kernel/qimage.cpp b/src/kernel/qimage.cpp
index d5a18b9..8d9f3bc 100644
--- a/src/kernel/qimage.cpp
+++ b/src/kernel/qimage.cpp
@@ -4716,10 +4716,16 @@
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;
|