void r_pkcs7_free_issuerandserialnumber (RPKCS7IssuerAndSerialNumber* iasu) {
	if (iasu) {
		r_x509_free_name (&iasu->issuer);
		r_asn1_free_object (iasu->serialNumber);
	}
}

The product dereferences a pointer that it expects to be valid but is NULL.