s3-libads: avoid crashing in ads_keytab_list().

Heimdal's krb5_kt_start_seq_get() will leave a non 0 fd in the krb5_kt_cursor
struct when it cannot find a given keytab.

Guenther

diff --git a/source3/libads/kerberos_keytab.c b/source3/libads/kerberos_keytab.c
index 94698c6cc29f17c7ca5a3ddd9818b26134eb2709..721a8c6f53086faf0b058eca690d76c79c2e4e64 100644 (file)
--- a/source3/libads/kerberos_keytab.c
+++ b/source3/libads/kerberos_keytab.c
@@ -756,6 +756,7 @@ int ads_keytab_list(const char *keytab_name)
 
        ret = krb5_kt_start_seq_get(context, keytab, &cursor);
        if (ret) {
+               ZERO_STRUCT(cursor);
                goto out;
        }