CVE-2021-3941

In ImfChromaticities.cpp routine RGBtoXYZ(), there are some division
operations such as float Z = (1 - chroma.white.x - chroma.white.y) * Y / chroma.white.y; and chroma.green.y * (X + Z))) / d; but the divisor is
not checked for a 0 value. A specially crafted file could trigger a
divide-by-zero condition which could affect the availability of programs
linked with OpenEXR.

Bugs

• <https://bugzilla.redhat.com/show_bug.cgi?id=2019789&gt;
• <https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=39084&gt;