Comment 1 for bug 1327268

I talked to Todd C. Miller, the author of sudo, who proposed the following patch:

diff -r 6c0cc2def911 plugins/sudoers/ldap.c
--- a/plugins/sudoers/ldap.c Wed Jun 04 11:43:39 2014 -0600
+++ b/plugins/sudoers/ldap.c Mon Jun 16 13:41:02 2014 -0600
@@ -2429,10 +2429,11 @@
        rc = ldap_sasl_interactive_bind_s(ld, ldap_conf.binddn, "GSSAPI",
            NULL, NULL, LDAP_SASL_QUIET, sudo_ldap_sasl_interact, auth_id);
        if (new_ccname != NULL) {
- rc = sudo_set_krb5_ccache_name(old_ccname, NULL);
+ rc = sudo_set_krb5_ccache_name(old_ccname ? old_ccname : "", NULL);
            if (rc == 0) {
                sudo_debug_printf(SUDO_DEBUG_INFO|SUDO_DEBUG_LINENO,
- "restore ccache name %s -> %s", new_ccname, old_ccname);
+ "restore ccache name %s -> %s", new_ccname,az
+ old_ccname ? old_ccname : "(none)");
            } else {
                sudo_debug_printf(SUDO_DEBUG_WARN|SUDO_DEBUG_LINENO,
                    "gss_krb5_ccache_name() failed: %d", rc);

We tested it in my 14.04LTS amd64 (sudo 1.8.9p5) install and that solved the problem. The above patch will be incorporated in the next version of sudo. But, I am posting it here in case someone wants to backport it to the sudo 1.8.9 ubuntu package