From HEAD:

Fix double-free in TLS server name extensions which could lead to a remote
crash found by Codenomicon TLS test suite (CVE-2008-0891)

Reviewed by: openssl-security@openssl.org

Obtained from: jorton@redhat.com

CHANGES

@@ -690,6 +690,10 @@
 
  Changes between 0.9.8g and 0.9.8h  [xx XXX xxxx]
 
+  *) Fix double free in TLS server name extensions which could lead to
+     a remote crash found by Codenomicon TLS test suite (CVE-2008-0891) 
+     [Joe Orton]
+
   *) Clear error queue in SSL_CTX_use_certificate_chain_file()
 
      Clear the error queue to ensure that error entries left from

ssl/t1_lib.c

@@ -637,6 +637,7 @@ int ssl_parse_clienthello_tlsext(SSL *s, unsigned char **p, unsigned char *d, in
 						s->session->tlsext_hostname[len]='\0';
 						if (strlen(s->session->tlsext_hostname) != len) {
 							OPENSSL_free(s->session->tlsext_hostname);
+							s->session->tlsext_hostname = NULL;
 							*al = TLS1_AD_UNRECOGNIZED_NAME;
 							return 0;
 						}