CVE-2021-45942: Out-of-bounds Write

OpenEXR 3.1.x before 3.1.4 has a heap-based buffer overflow in Imf31::LineCompositeTask::execute called from IlmThread31::NullThreadPoolProvider::addTask and IlmThread31::ThreadPool::addGlobalTask. NOTE: db217f2 may be inapplicable...