Thanks for the report, a slightly edited version of your patch was just pushed as commit bdb396ef2af

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** [bugs:#1220] Hostname validation fails for certs with empty Subject**
**Status:** closed-fixed
**Labels:** SSL/TLS 
**Created:** Thu May 02, 2013 11:52 PM UTC by John Gardiner Myers
**Last Updated:** Fri May 03, 2013 05:59 PM UTC
**Owner:** Daniel Stenberg
Curl incorrectly fails hostname validation for certs with an empty Subject but a matching, critical Subject Alternative Name. Such certificates are valid per RFC 2459 4.1.2.6
The attached Perl test case demonstrates the problem.
curl 7.30.0 (i686-pc-linux-gnu) libcurl/7.30.0 OpenSSL/1.0.1d zlib/1.2.5 c-ares/1.9.1
Protocols: dict file ftp ftps gopher http https imap imaps ldap ldaps pop3 pop3s rtsp smtp smtps telnet tftp
Features: AsynchDNS IPv6 Largefile NTLM NTLM_WB SSL libz TLS-SRP
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