CVE-2020-25666

There are 4 places in HistogramCompare() in MagickCore/histogram.c where an
integer overflow is possible during simple math calculations. This occurs
in the rgb values and count value for a color. The patch uses casts to
ssize_t type for these calculations, instead of int. This flaw could
impact application reliability in the event that ImageMagick processes a
crafted input file. This flaw affects ImageMagick versions prior to
7.0.9-0.

Bugs

• <https://github.com/ImageMagick/ImageMagick/issues/1750&gt;