OSV-2021-397 Heap-buffer-overflow in Crypto::UnsignedBigInteger::UnsignedBigInteger

OSS-Fuzz report: https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=30920 Crash type: Heap-buffer-overflow READ 1 Crash state: Crypto::UnsignedBigInteger::UnsignedBigInteger Crypto::UnsignedBigInteger::importdata Crypto::derdecodeinteger...