libnm-util: don't assert in nm_setting_get_secret_flags() and avoid assertion in agent_secrets_done_cb()

When secret providers return the connection hash in GetSecrets(),
this hash should only contain secrets. However, some providers also
return non-secret properties.

for_each_secret() iterated over all entries of the @secrets hash
and triggered the assertion in nm_setting_get_secret_flags() (see
below).

NM should not assert against user provided input. Change
nm_setting_get_secret_flags() to silently return FALSE, if the property
is not a secret.

Indeed, handling of secrets is very different for NMSettingVpn and
others. Hence nm_setting_get_secret_flags() has only an inconsistent
behavior and we have to fix all call sites to do the right thing
(depending on whether we have a VPN setting or not).

Now for_each_secret() checks whether the property is a secret
without hitting the assertion. Adjust all other calls of
nm_setting_get_secret_flags(), to anticipate non-secret flags and
assert/warn where appropriate.

Also, agent_secrets_done_cb() clears now all non-secrets properties
from the hash, using the new argument @remove_non_secrets when calling
for_each_secret().

  #0  0x0000003370c504e9 in g_logv () from /lib64/libglib-2.0.so.0
  #1  0x0000003370c5063f in g_log () from /lib64/libglib-2.0.so.0
  #2  0x00007fa4b0c1c156 in get_secret_flags (setting=0x1e3ac60, secret_name=0x1ea9180 "security", verify_secret=1, out_flags=0x7fff7507857c, error=0x0) at nm-setting.c:1091
  #3  0x00007fa4b0c1c2b2 in nm_setting_get_secret_flags (setting=0x1e3ac60, secret_name=0x1ea9180 "security", out_flags=0x7fff7507857c, error=0x0) at nm-setting.c:1124
  #4  0x0000000000463d03 in for_each_secret (connection=0x1deb2f0, secrets=0x1e9f860, callback=0x464f1b <has_system_owned_secrets>, callback_data=0x7fff7507865c) at settings/nm-settings-connection.c:203
  #5  0x000000000046525f in agent_secrets_done_cb (manager=0x1dddf50, call_id=1, agent_dbus_owner=0x1ddb9e0 ":1.39", agent_username=0x1e51710 "thom", agent_has_modify=1, setting_name=0x1e91f90 "802-11-wireless-security",
      flags=NM_SETTINGS_GET_SECRETS_FLAG_ALLOW_INTERACTION, secrets=0x1e9f860, error=0x0, user_data=0x1deb2f0, other_data2=0x477d61 <get_secrets_cb>, other_data3=0x1ea92a0) at settings/nm-settings-connection.c:757
  #6  0x00000000004dc4fd in get_complete_cb (parent=0x1ea6300, secrets=0x1e9f860, agent_dbus_owner=0x1ddb9e0 ":1.39", agent_username=0x1e51710 "thom", error=0x0, user_data=0x1dddf50) at settings/nm-agent-manager.c:1139
  #7  0x00000000004dab54 in req_complete_success (req=0x1ea6300, secrets=0x1e9f860, agent_dbus_owner=0x1ddb9e0 ":1.39", agent_uname=0x1e51710 "thom") at settings/nm-agent-manager.c:502
  #8  0x00000000004db86e in get_done_cb (agent=0x1e89530, call_id=0x1, secrets=0x1e9f860, error=0x0, user_data=0x1ea6300) at settings/nm-agent-manager.c:856
  #9  0x00000000004de9d0 in get_callback (proxy=0x1e47530, call=0x1, user_data=0x1ea10f0) at settings/nm-secret-agent.c:267
  #10 0x000000337380cad2 in complete_pending_call_and_unlock () from /lib64/libdbus-1.so.3
  #11 0x000000337380fdc1 in dbus_connection_dispatch () from /lib64/libdbus-1.so.3
  #12 0x000000342800ad65 in message_queue_dispatch () from /lib64/libdbus-glib-1.so.2
  #13 0x0000003370c492a6 in g_main_context_dispatch () from /lib64/libglib-2.0.so.0
  #14 0x0000003370c49628 in g_main_context_iterate.isra.24 () from /lib64/libglib-2.0.so.0
  #15 0x0000003370c49a3a in g_main_loop_run () from /lib64/libglib-2.0.so.0
  #16 0x000000000042e5c6 in main (argc=1, argv=0x7fff75078e88) at main.c:644

Signed-off-by: Thomas Haller <thaller@redhat.com>

9 files changed, 106 insertions, 47 deletions

diff --git a/libnm-core/nm-setting-vpn.c b/libnm-core/nm-setting-vpn.c
index 6ce4145029..667b83d78b 100644
--- a/libnm-core/nm-setting-vpn.c
+++ b/libnm-core/nm-setting-vpn.c
@@ -539,29 +539,31 @@ get_secret_flags (NMSetting *setting,
 	char *flags_key;
 	gpointer val;
 	unsigned long tmp;
+	NMSettingSecretFlags flags = NM_SETTING_SECRET_FLAG_NONE;
 
 	flags_key = g_strdup_printf ("%s-flags", secret_name);
 	if (g_hash_table_lookup_extended (priv->data, flags_key, NULL, &val)) {
 		errno = 0;
 		tmp = strtoul ((const char *) val, NULL, 10);
 		if ((errno == 0) && (tmp <= NM_SETTING_SECRET_FLAGS_ALL)) {
-			if (out_flags)
-				*out_flags = (guint32) tmp;
+			flags = (NMSettingSecretFlags) tmp;
 			success = TRUE;
 		} else {
 			g_set_error (error,
 			             NM_SETTING_ERROR,
 			             NM_SETTING_ERROR_PROPERTY_TYPE_MISMATCH,
-			             "Failed to convert '%s' value '%s' to uint",
+			             _("Failed to convert '%s' value '%s' to uint"),
 			             flags_key, (const char *) val);
 		}
 	} else {
 		g_set_error (error,
 		             NM_SETTING_ERROR,
 		             NM_SETTING_ERROR_PROPERTY_NOT_FOUND,
-		             "Secret flags property '%s' not found", flags_key);
+		             _("Secret flags property '%s' not found"), flags_key);
 	}
 	g_free (flags_key);
+	if (out_flags)
+		*out_flags = flags;
 	return success;
 }
 
diff --git a/libnm-core/nm-setting.c b/libnm-core/nm-setting.c
index f4ad8bbd16..3de3309018 100644
--- a/libnm-core/nm-setting.c
+++ b/libnm-core/nm-setting.c
@@ -1002,8 +1002,12 @@ compare_property (NMSetting *setting,
 		NMSettingSecretFlags a_secret_flags = NM_SETTING_SECRET_FLAG_NONE;
 		NMSettingSecretFlags b_secret_flags = NM_SETTING_SECRET_FLAG_NONE;
 
-		nm_setting_get_secret_flags (setting, prop_spec->name, &a_secret_flags, NULL);
-		nm_setting_get_secret_flags (other, prop_spec->name, &b_secret_flags, NULL);
+		g_return_val_if_fail (!NM_IS_SETTING_VPN (setting), FALSE);
+
+		if (!nm_setting_get_secret_flags (setting, prop_spec->name, &a_secret_flags, NULL))
+			g_return_val_if_reached (FALSE);
+		if (!nm_setting_get_secret_flags (other, prop_spec->name, &b_secret_flags, NULL))
+			g_return_val_if_reached (FALSE);
 
 		/* If the secret flags aren't the same the settings aren't the same */
 		if (a_secret_flags != b_secret_flags)
@@ -1108,7 +1112,16 @@ should_compare_prop (NMSetting *setting,
 		if (comp_flags & NM_SETTING_COMPARE_FLAG_IGNORE_SECRETS)
 			return FALSE;
 
-		nm_setting_get_secret_flags (setting, prop_name, &secret_flags, NULL);
+		if (   NM_IS_SETTING_VPN (setting)
+		    && g_strcmp0 (prop_name, NM_SETTING_VPN_SECRETS) == 0) {
+			/* FIXME: NMSettingVPN:NM_SETTING_VPN_SECRETS has NM_SETTING_PARAM_SECRET.
+			 * nm_setting_get_secret_flags() quite possibly fails, but it might succeed if the
+			 * setting accidently uses a key "secrets". */
+			return TRUE;
+		}
+
+		if (!nm_setting_get_secret_flags (setting, prop_name, &secret_flags, NULL))
+			g_return_val_if_reached (FALSE);
 
 		if (   (comp_flags & NM_SETTING_COMPARE_FLAG_IGNORE_AGENT_OWNED_SECRETS)
 		    && (secret_flags & NM_SETTING_SECRET_FLAG_AGENT_OWNED))
@@ -1330,8 +1343,12 @@ clear_secrets_with_flags (NMSetting *setting,
 	NMSettingSecretFlags flags = NM_SETTING_SECRET_FLAG_NONE;
 	gboolean changed = FALSE;
 
+	g_return_val_if_fail (!NM_IS_SETTING_VPN (setting), FALSE);
+
 	/* Clear the secret if the user function says to do so */
-	nm_setting_get_secret_flags (setting, pspec->name, &flags, NULL);
+	if (!nm_setting_get_secret_flags (setting, pspec->name, &flags, NULL))
+		g_return_val_if_reached (FALSE);
+
 	if (func (setting, pspec->name, flags, user_data) == TRUE) {
 		GValue value = G_VALUE_INIT;
 
@@ -1549,8 +1566,11 @@ get_secret_flags (NMSetting *setting,
 	char *flags_prop;
 	NMSettingSecretFlags flags = NM_SETTING_SECRET_FLAG_NONE;
 
-	if (verify_secret)
-		g_return_val_if_fail (is_secret_prop (setting, secret_name, error), FALSE);
+	if (verify_secret && !is_secret_prop (setting, secret_name, error)) {
+		if (out_flags)
+			*out_flags = NM_SETTING_SECRET_FLAG_NONE;
+		return FALSE;
+	}
 
 	flags_prop = g_strdup_printf ("%s-flags", secret_name);
 	g_object_get (G_OBJECT (setting), flags_prop, &flags, NULL);
diff --git a/libnm-util/nm-setting-vpn.c b/libnm-util/nm-setting-vpn.c
index be892da485..70f955b010 100644
--- a/libnm-util/nm-setting-vpn.c
+++ b/libnm-util/nm-setting-vpn.c
@@ -545,29 +545,31 @@ get_secret_flags (NMSetting *setting,
 	char *flags_key;
 	gpointer val;
 	unsigned long tmp;
+	NMSettingSecretFlags flags = NM_SETTING_SECRET_FLAG_NONE;
 
 	flags_key = g_strdup_printf ("%s-flags", secret_name);
 	if (g_hash_table_lookup_extended (priv->data, flags_key, NULL, &val)) {
 		errno = 0;
 		tmp = strtoul ((const char *) val, NULL, 10);
 		if ((errno == 0) && (tmp <= NM_SETTING_SECRET_FLAGS_ALL)) {
-			if (out_flags)
-				*out_flags = (guint32) tmp;
+			flags = (NMSettingSecretFlags) tmp;
 			success = TRUE;
 		} else {
 			g_set_error (error,
 			             NM_SETTING_ERROR,
 			             NM_SETTING_ERROR_PROPERTY_TYPE_MISMATCH,
-			             "Failed to convert '%s' value '%s' to uint",
+			             _("Failed to convert '%s' value '%s' to uint"),
 			             flags_key, (const char *) val);
 		}
 	} else {
 		g_set_error (error,
 		             NM_SETTING_ERROR,
 		             NM_SETTING_ERROR_PROPERTY_NOT_FOUND,
-		             "Secret flags property '%s' not found", flags_key);
+		             _("Secret flags property '%s' not found"), flags_key);
 	}
 	g_free (flags_key);
+	if (out_flags)
+		*out_flags = flags;
 	return success;
 }
 
diff --git a/libnm-util/nm-setting.c b/libnm-util/nm-setting.c
index 2508a401fa..0ca28dba16 100644
--- a/libnm-util/nm-setting.c
+++ b/libnm-util/nm-setting.c
@@ -542,8 +542,12 @@ compare_property (NMSetting *setting,
 		NMSettingSecretFlags a_secret_flags = NM_SETTING_SECRET_FLAG_NONE;
 		NMSettingSecretFlags b_secret_flags = NM_SETTING_SECRET_FLAG_NONE;
 
-		nm_setting_get_secret_flags (setting, prop_spec->name, &a_secret_flags, NULL);
-		nm_setting_get_secret_flags (other, prop_spec->name, &b_secret_flags, NULL);
+		g_return_val_if_fail (!NM_IS_SETTING_VPN (setting), FALSE);
+
+		if (!nm_setting_get_secret_flags (setting, prop_spec->name, &a_secret_flags, NULL))
+			g_return_val_if_reached (FALSE);
+		if (!nm_setting_get_secret_flags (other, prop_spec->name, &b_secret_flags, NULL))
+			g_return_val_if_reached (FALSE);
 
 		/* If the secret flags aren't the same the settings aren't the same */
 		if (a_secret_flags != b_secret_flags)
@@ -648,7 +652,16 @@ should_compare_prop (NMSetting *setting,
 		if (comp_flags & NM_SETTING_COMPARE_FLAG_IGNORE_SECRETS)
 			return FALSE;
 
-		nm_setting_get_secret_flags (setting, prop_name, &secret_flags, NULL);
+		if (   NM_IS_SETTING_VPN (setting)
+		    && g_strcmp0 (prop_name, NM_SETTING_VPN_SECRETS) == 0) {
+			/* FIXME: NMSettingVPN:NM_SETTING_VPN_SECRETS has NM_SETTING_PARAM_SECRET.
+			 * nm_setting_get_secret_flags() quite possibly fails, but it might succeed if the
+			 * setting accidently uses a key "secrets". */
+			return FALSE;
+		}
+
+		if (!nm_setting_get_secret_flags (setting, prop_name, &secret_flags, NULL))
+			g_return_val_if_reached (FALSE);
 
 		if (   (comp_flags & NM_SETTING_COMPARE_FLAG_IGNORE_AGENT_OWNED_SECRETS)
 		    && (secret_flags & NM_SETTING_SECRET_FLAG_AGENT_OWNED))
@@ -870,8 +883,12 @@ clear_secrets_with_flags (NMSetting *setting,
 	NMSettingSecretFlags flags = NM_SETTING_SECRET_FLAG_NONE;
 	gboolean changed = FALSE;
 
+	g_return_val_if_fail (!NM_IS_SETTING_VPN (setting), FALSE);
+
 	/* Clear the secret if the user function says to do so */
-	nm_setting_get_secret_flags (setting, pspec->name, &flags, NULL);
+	if (!nm_setting_get_secret_flags (setting, pspec->name, &flags, NULL))
+		g_return_val_if_reached (FALSE);
+
 	if (func (setting, pspec->name, flags, user_data) == TRUE) {
 		GValue value = G_VALUE_INIT;
 
@@ -1090,8 +1107,11 @@ get_secret_flags (NMSetting *setting,
 	char *flags_prop;
 	NMSettingSecretFlags flags = NM_SETTING_SECRET_FLAG_NONE;
 
-	if (verify_secret)
-		g_return_val_if_fail (is_secret_prop (setting, secret_name, error), FALSE);
+	if (verify_secret && !is_secret_prop (setting, secret_name, error)) {
+		if (out_flags)
+			*out_flags = NM_SETTING_SECRET_FLAG_NONE;
+		return FALSE;
+	}
 
 	flags_prop = g_strdup_printf ("%s-flags", secret_name);
 	g_object_get (G_OBJECT (setting), flags_prop, &flags, NULL);
diff --git a/src/devices/wifi/nm-device-wifi.c b/src/devices/wifi/nm-device-wifi.c
index 8508097886..6d93833792 100644
--- a/src/devices/wifi/nm-device-wifi.c
+++ b/src/devices/wifi/nm-device-wifi.c
@@ -2053,10 +2053,11 @@ need_new_8021x_secrets (NMDeviceWifi *self,
 
 	s_8021x = nm_connection_get_setting_802_1x (connection);
 	if (s_8021x) {
-		nm_setting_get_secret_flags (NM_SETTING (s_8021x),
-		                             NM_SETTING_802_1X_PASSWORD,
-		                             &secret_flags,
-		                             NULL);
+		if (!nm_setting_get_secret_flags (NM_SETTING (s_8021x),
+		                                  NM_SETTING_802_1X_PASSWORD,
+		                                  &secret_flags,
+		                                  NULL))
+			g_assert_not_reached ();
 		if (secret_flags & NM_SETTING_SECRET_FLAG_NOT_SAVED)
 			*setting_name = NM_SETTING_802_1X_SETTING_NAME;
 		return *setting_name ? TRUE : FALSE;
@@ -2064,10 +2065,11 @@ need_new_8021x_secrets (NMDeviceWifi *self,
 
 	s_wsec = nm_connection_get_setting_wireless_security (connection);
 	if (s_wsec) {
-		nm_setting_get_secret_flags (NM_SETTING (s_wsec),
-		                             NM_SETTING_WIRELESS_SECURITY_LEAP_PASSWORD,
-		                             &secret_flags,
-		                             NULL);
+		if (!nm_setting_get_secret_flags (NM_SETTING (s_wsec),
+		                                  NM_SETTING_WIRELESS_SECURITY_LEAP_PASSWORD,
+		                                  &secret_flags,
+		                                  NULL))
+			g_assert_not_reached ();
 		if (secret_flags & NM_SETTING_SECRET_FLAG_NOT_SAVED)
 			*setting_name = NM_SETTING_WIRELESS_SECURITY_SETTING_NAME;
 		return *setting_name ? TRUE : FALSE;
diff --git a/src/settings/nm-agent-manager.c b/src/settings/nm-agent-manager.c
index 0de63ffb16..1076ae2143 100644
--- a/src/settings/nm-agent-manager.c
+++ b/src/settings/nm-agent-manager.c
@@ -1010,7 +1010,8 @@ check_system_secrets_cb (NMSetting *setting,
 				*has_system = TRUE;
 		}
 	} else {
-		nm_setting_get_secret_flags (setting, key, &secret_flags, NULL);
+		if (!nm_setting_get_secret_flags (setting, key, &secret_flags, NULL))
+			g_return_if_reached ();
 		if (secret_flags == NM_SETTING_SECRET_FLAG_NONE)
 			*has_system = TRUE;
 	}
diff --git a/src/settings/nm-settings-connection.c b/src/settings/nm-settings-connection.c
index 1e0106d07b..859581139e 100644
--- a/src/settings/nm-settings-connection.c
+++ b/src/settings/nm-settings-connection.c
@@ -144,6 +144,7 @@ typedef gboolean (*ForEachSecretFunc) (GHashTableIter *iter,
 static void
 for_each_secret (NMConnection *connection,
                  GHashTable *secrets,
+                 gboolean remove_non_secrets,
                  ForEachSecretFunc callback,
                  gpointer callback_data)
 {
@@ -167,6 +168,8 @@ for_each_secret (NMConnection *connection,
 	 * each time.
 	 */
 
+	g_return_if_fail (callback);
+
 	/* Walk through the list of setting hashes */
 	g_hash_table_iter_init (&iter, secrets);
 	while (g_hash_table_iter_next (&iter, (gpointer) &setting_name, (gpointer) &setting_hash)) {
@@ -175,6 +178,9 @@ for_each_secret (NMConnection *connection,
 		const char *secret_name;
 		GValue *val;
 
+		if (g_hash_table_size (setting_hash) == 0)
+			continue;
+
 		/* Get the actual NMSetting from the connection so we can get secret flags
 		 * from the connection data, since flags aren't secrets.  What we're
 		 * iterating here is just the secrets, not a whole connection.
@@ -203,7 +209,11 @@ for_each_secret (NMConnection *connection,
 						return;
 				}
 			} else {
-				nm_setting_get_secret_flags (setting, secret_name, &secret_flags, NULL);
+				if (!nm_setting_get_secret_flags (setting, secret_name, &secret_flags, NULL)) {
+					if (remove_non_secrets)
+						g_hash_table_iter_remove (&secret_iter);
+					continue;
+				}
 				if (callback (&secret_iter, secret_flags, callback_data) == FALSE)
 					return;
 			}
@@ -764,7 +774,7 @@ agent_secrets_done_cb (NMAgentManager *manager,
 		 * save those system-owned secrets.  If not, discard them and use the
 		 * existing secrets, or fail the connection.
 		 */
-		for_each_secret (NM_CONNECTION (self), secrets, has_system_owned_secrets, &agent_had_system);
+		for_each_secret (NM_CONNECTION (self), secrets, TRUE, has_system_owned_secrets, &agent_had_system);
 		if (agent_had_system) {
 			if (flags == NM_SECRET_AGENT_GET_SECRETS_FLAG_NONE) {
 				/* No user interaction was allowed when requesting secrets; the
@@ -776,7 +786,7 @@ agent_secrets_done_cb (NMAgentManager *manager,
 				            call_id,
 				            agent_dbus_owner);
 
-				for_each_secret (NM_CONNECTION (self), secrets, clear_nonagent_secrets, NULL);
+				for_each_secret (NM_CONNECTION (self), secrets, FALSE, clear_nonagent_secrets, NULL);
 			} else if (agent_has_modify == FALSE) {
 				/* Agent didn't successfully authenticate; clear system-owned secrets
 				 * from the secrets the agent returned.
@@ -786,7 +796,7 @@ agent_secrets_done_cb (NMAgentManager *manager,
 				            setting_name,
 				            call_id);
 
-				for_each_secret (NM_CONNECTION (self), secrets, clear_nonagent_secrets, NULL);
+				for_each_secret (NM_CONNECTION (self), secrets, FALSE, clear_nonagent_secrets, NULL);
 			}
 		}
 	} else {
@@ -805,7 +815,7 @@ agent_secrets_done_cb (NMAgentManager *manager,
 	 * came back.  Unsaved secrets by definition require user interaction.
 	 */
 	if (flags == NM_SECRET_AGENT_GET_SECRETS_FLAG_NONE)
-		for_each_secret (NM_CONNECTION (self), secrets, clear_unsaved_secrets, NULL);
+		for_each_secret (NM_CONNECTION (self), secrets, TRUE, clear_unsaved_secrets, NULL);
 
 	/* Update the connection with our existing secrets from backing storage */
 	nm_connection_clear_secrets (NM_CONNECTION (self));
diff --git a/src/settings/plugins/ifnet/connection_parser.c b/src/settings/plugins/ifnet/connection_parser.c
index 15dd3874a5..25b958fd4f 100644
--- a/src/settings/plugins/ifnet/connection_parser.c
+++ b/src/settings/plugins/ifnet/connection_parser.c
@@ -2846,7 +2846,8 @@ check_unsupported_secrets (NMSetting  *setting,
 	if (flags & NM_SETTING_PARAM_SECRET) {
 		NMSettingSecretFlags secret_flags = NM_SETTING_SECRET_FLAG_NONE;
 
-		nm_setting_get_secret_flags (setting, key, &secret_flags, NULL);
+		if (!nm_setting_get_secret_flags (setting, key, &secret_flags, NULL))
+			g_return_if_reached ();
 		if (secret_flags != NM_SETTING_SECRET_FLAG_NONE)
 			*unsupported_secret = TRUE;
 	}
@@ -2869,17 +2870,6 @@ ifnet_can_write_connection (NMConnection *connection, GError **error)
 		return FALSE;
 	}
 
-	/* If the connection has flagged secrets, ignore
-	 * it as this plugin does not deal with user agent service */
-	nm_connection_for_each_setting_value (connection,
-	                                      check_unsupported_secrets,
-	                                      &has_unsupported_secrets);
-	if (has_unsupported_secrets) {
-		g_set_error_literal (error, IFNET_PLUGIN_ERROR, 0,
-		                     "The ifnet plugin only supports persistent system secrets.");
-		return FALSE;
-	}
-
 	/* Only support wired, wifi, and PPPoE */
 	if (   !nm_connection_is_type (connection, NM_SETTING_WIRED_SETTING_NAME)
 	    && !nm_connection_is_type (connection, NM_SETTING_WIRELESS_SETTING_NAME)
@@ -2891,6 +2881,17 @@ ifnet_can_write_connection (NMConnection *connection, GError **error)
 		return FALSE;
 	}
 
+	/* If the connection has flagged secrets, ignore
+	 * it as this plugin does not deal with user agent service */
+	nm_connection_for_each_setting_value (connection,
+	                                      check_unsupported_secrets,
+	                                      &has_unsupported_secrets);
+	if (has_unsupported_secrets) {
+		g_set_error_literal (error, IFNET_PLUGIN_ERROR, 0,
+		                     "The ifnet plugin only supports persistent system secrets.");
+		return FALSE;
+	}
+
 	return TRUE;
 }
 
diff --git a/src/settings/plugins/keyfile/writer.c b/src/settings/plugins/keyfile/writer.c
index ae8f0a912b..2661d50066 100644
--- a/src/settings/plugins/keyfile/writer.c
+++ b/src/settings/plugins/keyfile/writer.c
@@ -797,7 +797,8 @@ write_setting_value (NMSetting *setting,
 	if (pspec && (pspec->flags & NM_SETTING_PARAM_SECRET) && !NM_IS_SETTING_VPN (setting)) {
 		NMSettingSecretFlags secret_flags = NM_SETTING_SECRET_FLAG_NONE;
 
-		nm_setting_get_secret_flags (setting, key, &secret_flags, NULL);
+		if (!nm_setting_get_secret_flags (setting, key, &secret_flags, NULL))
+			g_assert_not_reached ();
 		if (secret_flags != NM_SETTING_SECRET_FLAG_NONE)
 			return;
 	}