OSV-2020-58 Heap-buffer-overflow in asn1_get_next

OSS-Fuzz report: https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=20373 Crash type: Heap-buffer-overflow READ 1 Crash state: asn1getnext x509parseextcertificatepolicies x509parseextensiondata...