OSV-2020-2171 Stack-buffer-overflow in fp_read_unsigned_bin

OSS-Fuzz report: https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=27666 Crash type: Stack-buffer-overflow READ 8 Crash state: fpreadunsignedbin mpreadunsignedbin wcRsaPublicKeyDecodeRaw...