The code for releasing DH parameters is common to all credential
subclasses, and the unload function is only called from the
finalizers, except for x509 reload, so can be moved into the
parent with a little update of the reload method.

Reviewed-by: Marc-André Lureau <marcandre.lureau@redhat.com>
Signed-off-by: Daniel P. Berrangé <berrange@redhat.com>
---
 crypto/tlscreds.c     | 6 ++++++
 crypto/tlscredsanon.c | 4 ----
 crypto/tlscredspsk.c  | 4 ----
 crypto/tlscredsx509.c | 7 +++----
 4 files changed, 9 insertions(+), 12 deletions(-)

diff --git a/crypto/tlscreds.c b/crypto/tlscreds.c
index 65e97ddd11..a9e0caf864 100644
--- a/crypto/tlscreds.c
+++ b/crypto/tlscreds.c
@@ -246,6 +246,12 @@ qcrypto_tls_creds_finalize(Object *obj)
 {
     QCryptoTLSCreds *creds = QCRYPTO_TLS_CREDS(obj);
 
+#ifdef CONFIG_GNUTLS
+    if (creds->dh_params) {
+        gnutls_dh_params_deinit(creds->dh_params);
+    }
+#endif
+
     g_free(creds->dir);
     g_free(creds->priority);
 }
diff --git a/crypto/tlscredsanon.c b/crypto/tlscredsanon.c
index bc3351b5d6..1ddfe4eb31 100644
--- a/crypto/tlscredsanon.c
+++ b/crypto/tlscredsanon.c
@@ -92,10 +92,6 @@ qcrypto_tls_creds_anon_unload(QCryptoTLSCredsAnon *creds)
             creds->data.server = NULL;
         }
     }
-    if (creds->parent_obj.dh_params) {
-        gnutls_dh_params_deinit(creds->parent_obj.dh_params);
-        creds->parent_obj.dh_params = NULL;
-    }
 }
 
 #else /* ! CONFIG_GNUTLS */
diff --git a/crypto/tlscredspsk.c b/crypto/tlscredspsk.c
index 545d3e45db..bf4efe2114 100644
--- a/crypto/tlscredspsk.c
+++ b/crypto/tlscredspsk.c
@@ -175,10 +175,6 @@ qcrypto_tls_creds_psk_unload(QCryptoTLSCredsPSK *creds)
             creds->data.server = NULL;
         }
     }
-    if (creds->parent_obj.dh_params) {
-        gnutls_dh_params_deinit(creds->parent_obj.dh_params);
-        creds->parent_obj.dh_params = NULL;
-    }
 }
 
 #else /* ! CONFIG_GNUTLS */
diff --git a/crypto/tlscredsx509.c b/crypto/tlscredsx509.c
index 2519f7690b..d93905ec77 100644
--- a/crypto/tlscredsx509.c
+++ b/crypto/tlscredsx509.c
@@ -684,10 +684,6 @@ qcrypto_tls_creds_x509_unload(QCryptoTLSCredsX509 *creds)
         gnutls_certificate_free_credentials(creds->data);
         creds->data = NULL;
     }
-    if (creds->parent_obj.dh_params) {
-        gnutls_dh_params_deinit(creds->parent_obj.dh_params);
-        creds->parent_obj.dh_params = NULL;
-    }
 }
 
 
@@ -779,6 +775,9 @@ qcrypto_tls_creds_x509_reload(QCryptoTLSCreds *creds, Error **errp)
     qcrypto_tls_creds_x509_load(x509_creds, &local_err);
     if (local_err) {
         qcrypto_tls_creds_x509_unload(x509_creds);
+        if (creds->dh_params) {
+            gnutls_dh_params_deinit(creds->dh_params);
+        }
         x509_creds->data = creds_data;
         creds->dh_params = creds_dh_params;
         error_propagate(errp, local_err);
-- 
2.51.1