27e3756 Fix CRL handling (CVE-2019-19269)

Authored and Committed by pghmcfc 4 years ago
    Fix CRL handling (CVE-2019-19269)
    
    Fix handling of CRL lookups by properly using issuer for lookups, and
    guarding against null pointers (GH#859, GH#861, CVE-2019-19269).
    
        
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