OSV-2021-494 Heap-buffer-overflow in AK::ByteBuffer::overwrite

OSS-Fuzz report: https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=31698 Crash type: Heap-buffer-overflow READ 1 Crash state: AK::ByteBuffer::overwrite Crypto::PK::RSA::parsersakey FuzzRSAKeyParsing.cpp...