From 3879bf3074ad4611027ea8022e1fd53022eda883 Mon Sep 17 00:00:00 2001
From: Marcel Holtmann <marcel@holtmann.org>
Date: Wed, 22 Apr 2009 16:27:11 +0100
Subject: [PATCH] Handle errors with DBusPendingCall and lost connection

---
 plugins/bluetooth.c  |   34 ++++++++++++++++++++++++++++++++--
 plugins/modemmgr.c   |    9 +++++++--
 plugins/supplicant.c |   29 +++++++++++++++++++++++++++++
 3 files changed, 68 insertions(+), 4 deletions(-)

diff --git a/plugins/bluetooth.c b/plugins/bluetooth.c
index 12519c5..009c6c7 100644
--- a/plugins/bluetooth.c
+++ b/plugins/bluetooth.c
@@ -117,6 +117,13 @@ static void get_properties(DBusConnection *connection,
 		return;
 	}
 
+	if (call == NULL) {
+		connman_error("D-Bus connection not available");
+		dbus_message_unref(message);
+		g_free(data);
+		return;
+	}
+
 	data->connection = connection;
 	data->message    = message;
 	data->callback   = callback;
@@ -240,6 +247,12 @@ static int pan_connect(struct connman_network *network)
 		return -EINVAL;
 	}
 
+	if (call == NULL) {
+		connman_error("D-Bus connection not available");
+		dbus_message_unref(message);
+		return -EINVAL;
+	}
+
 	dbus_pending_call_set_notify(call, connect_reply, network, NULL);
 
 	dbus_message_unref(message);
@@ -307,6 +320,12 @@ static int pan_disconnect(struct connman_network *network)
 		return -EINVAL;
 	}
 
+	if (call == NULL) {
+		connman_error("D-Bus connection not available");
+		dbus_message_unref(message);
+		return -EINVAL;
+	}
+
 	dbus_pending_call_set_notify(call, disconnect_reply, network, NULL);
 
 	dbus_message_unref(message);
@@ -393,6 +412,12 @@ static int change_powered(DBusConnection *connection, const char *path,
 		return -EINVAL;
 	}
 
+	if (call == NULL) {
+		connman_error("D-Bus connection not available");
+		dbus_message_unref(message);
+		return -EINVAL;
+	}
+
 	dbus_pending_call_set_notify(call, powered_reply, NULL, NULL);
 
 	dbus_message_unref(message);
@@ -718,13 +743,18 @@ static void bluetooth_connect(DBusConnection *connection, void *user_data)
 	if (dbus_connection_send_with_reply(connection, message,
 						&call, TIMEOUT) == FALSE) {
 		connman_error("Failed to get Bluetooth adapters");
-		dbus_message_unref(message);
-		return;
+		goto done;
+	}
+
+	if (call == NULL) {
+		connman_error("D-Bus connection not available");
+		goto done;
 	}
 
 	dbus_pending_call_set_notify(call, list_adapters_reply,
 							connection, NULL);
 
+done:
 	dbus_message_unref(message);
 }
 
diff --git a/plugins/modemmgr.c b/plugins/modemmgr.c
index cbb5ebd..0950848 100644
--- a/plugins/modemmgr.c
+++ b/plugins/modemmgr.c
@@ -65,13 +65,18 @@ static void modemmgr_connect(DBusConnection *connection, void *user_data)
 	if (dbus_connection_send_with_reply(connection, message,
 						&call, TIMEOUT) == FALSE) {
 		connman_error("Failed to get modem devices");
-		dbus_message_unref(message);
-		return;
+		goto done;
+	}
+
+	if (call == NULL) {
+		connman_error("D-Bus connection not available");
+		goto done;
 	}
 
 	dbus_pending_call_set_notify(call, enumerate_devices_reply,
 							NULL, NULL);
 
+done:
 	dbus_message_unref(message);
 }
 
diff --git a/plugins/supplicant.c b/plugins/supplicant.c
index 69ef372..fc57d35 100644
--- a/plugins/supplicant.c
+++ b/plugins/supplicant.c
@@ -279,6 +279,12 @@ static int add_interface(struct supplicant_task *task)
 		return -EIO;
 	}
 
+	if (call == NULL) {
+		connman_error("D-Bus connection not available");
+		dbus_message_unref(message);
+		return -EIO;
+	}
+
 	dbus_pending_call_set_notify(call, add_interface_reply, task, NULL);
 
 	dbus_message_unref(message);
@@ -349,6 +355,12 @@ static int create_interface(struct supplicant_task *task)
 		return -EIO;
 	}
 
+	if (call == NULL) {
+		connman_error("D-Bus connection not available");
+		dbus_message_unref(message);
+		return -EIO;
+	}
+
 	dbus_pending_call_set_notify(call, get_interface_reply, task, NULL);
 
 	dbus_message_unref(message);
@@ -401,6 +413,12 @@ static int remove_interface(struct supplicant_task *task)
 		return -EIO;
 	}
 
+	if (call == NULL) {
+		connman_error("D-Bus connection not available");
+		dbus_message_unref(message);
+		return -EIO;
+	}
+
 	dbus_pending_call_set_notify(call, remove_interface_reply, task, NULL);
 
 	dbus_message_unref(message);
@@ -1129,6 +1147,12 @@ static void get_properties(struct supplicant_task *task)
 		goto noscan;
 	}
 
+	if (call == NULL) {
+		connman_error("D-Bus connection not available");
+		dbus_message_unref(message);
+		goto noscan;
+	}
+
 	dbus_pending_call_set_notify(call, properties_reply, task, NULL);
 
 	dbus_message_unref(message);
@@ -1220,6 +1244,11 @@ static void scan_results_available(struct supplicant_task *task)
 	if (task->noscan == FALSE)
 		connman_device_set_scanning(task->device, TRUE);
 
+	if (call == NULL) {
+		connman_error("D-Bus connection not available");
+		goto done;
+	}
+
 	dbus_pending_call_set_notify(call, scan_results_reply, task, NULL);
 
 done:
-- 
1.7.9.5