OSV-2021-1711 Heap-buffer-overflow in cmap_endcodespacerange_func

OSS-Fuzz report: https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=42541 Crash type: Heap-buffer-overflow WRITE Crash state: cmapendcodespacerangefunc pdfipscriptinterpret pdfireadcmap...