OSV-2020-1819 Heap-buffer-overflow in void cv::copyToMat<int>

OSS-Fuzz report: https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=25779 Crash type: Heap-buffer-overflow READ 4 Crash state: void cv::copyToMat cv::decodeSRGBData cv::Jpeg2KOpjDecoder::readData...