OSV-2021-394 Heap-buffer-overflow in Crypto::der_decode_sequence

OSS-Fuzz report: https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=30906 Crash type: Heap-buffer-overflow READ 1 Crash state: Crypto::derdecodesequence Crypto::PK::RSA::parsersakey FuzzRSAKeyParsing.cpp...