OSV-2021-443 Segv on unknown address in Imf_2_5::copyIntoFrameBuffer

OSS-Fuzz report: https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=31293 Crash type: Segv on unknown address Crash state: Imf25::copyIntoFrameBuffer Imf25::LineBufferTask::execute IlmThread::NullThreadPoolProvider::addTask...