OSV-2020-1245 Heap-buffer-overflow in c2i_ASN1_INTEGER

OSS-Fuzz report: https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=14142 Crash type: Heap-buffer-overflow READ 1 Crash state: c2iASN1INTEGER asn1exc2i asn1d2iexprimitive...