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Date: Mon, 19 Nov 2007 08:12:42 -0600 (CST)
Message-Id: <200711191412.IAA02137@malison.ait.iastate.edu>
To: krb5-bugs@mit.edu
Subject: krb5_sendauth double free error
From: john@iastate.edu
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>Submitter-Id:	net
>Originator:	John Hascall
>Organization:  Iosa State University
>Confidential:	no
>Synopsis:	krb5_sendauth can double free creds.server
>Severity:	critical
>Priority:	high
>Category:	krb5-libs
>Class:		sw-bug
>Release:	1.6.3
>Environment:
System: OSF1 malison.ait.iastate.edu V4.0 1229 alpha
Architecture: axp
Machine: alpha
>Description:
Starting at line 102 of src/lib/krb5/krb/sendauth.c (V1.6.3)
we see:
                if ((retval = krb5_copy_principal(context, server,
                                                  &creds.server)))
                        goto error_return;
                if (client)
                        retval = krb5_copy_principal(context, client,
                                                     &creds.client);
                else
                        retval = krb5_cc_get_principal(context, use_ccache,
                                                       &creds.client);
                if (retval) {
                        krb5_free_principal(context, creds.server);
                        goto error_return;
     ...
error_return:
    krb5_free_cred_contents(context, &creds);

Does this not free creds.server twice
if krb5_copy_principal or (as in my case) krb5_cc_get_principal fails?

>How-To-Repeat:
	call krb5_sendauth with client==NULL, in_creds==NULL, ccache==NULL
	and no ccache file.
>Fix:
	Delete line 112:
                        krb5_free_principal(context, creds.server);