Use calloc() instead of malloc() when allocating 'struct' or array in memory

common/gattlib_callback_discovered_device.c

@@ -83,7 +83,7 @@ static void* _discovered_device_thread_args_allocator(va_list args) {
 	struct gattlib_adapter* gattlib_adapter = va_arg(args, struct gattlib_adapter*);
 	OrgBluezDevice1* device1 = va_arg(args, OrgBluezDevice1*);
 
-	struct gattlib_discovered_device_thread_args* thread_args = malloc(sizeof(struct gattlib_discovered_device_thread_args));
+	struct gattlib_discovered_device_thread_args* thread_args = calloc(sizeof(struct gattlib_discovered_device_thread_args), 1);
 	thread_args->gattlib_adapter = gattlib_adapter;
 	thread_args->mac_address = strdup(org_bluez_device1_get_address(device1));
 	const char* device_name = org_bluez_device1_get_name(device1);

common/gattlib_callback_notification_device.c

@@ -76,9 +76,9 @@ void gattlib_notification_device_thread(gpointer data, gpointer user_data) {
 }
 
 static void* _notification_device_thread_args_allocator(gatt_connection_t* connection, const uuid_t* uuid, const uint8_t* data, size_t data_length) {
-	struct gattlib_notification_device_thread_args* thread_args = malloc(sizeof(struct gattlib_notification_device_thread_args));
+	struct gattlib_notification_device_thread_args* thread_args = calloc(sizeof(struct gattlib_notification_device_thread_args), 1);
 	thread_args->connection = connection;
-	thread_args->uuid = malloc(sizeof(uuid_t));
+	thread_args->uuid = calloc(sizeof(uuid_t), 1);
 	if (thread_args->uuid != NULL) {
 		memcpy(thread_args->uuid, uuid, sizeof(uuid_t));
 	}

common/gattlib_callback_python.c

@@ -11,7 +11,7 @@ void* gattlib_python_callback_args(PyObject* python_callback, PyObject* python_a
 	assert(python_callback != NULL);
 	assert(python_args != NULL);
 
-	struct gattlib_python_args* args = malloc(sizeof(struct gattlib_python_args));
+	struct gattlib_python_args* args = calloc(sizeof(struct gattlib_python_args), 1);
 	if (args == NULL) {
 		GATTLIB_LOG(GATTLIB_ERROR, "Failed to allocate Python arguments for Python callback.");
 		return NULL;

common/gattlib_common.c

@@ -156,8 +156,12 @@ void gattlib_handler_free(struct gattlib_handler* handler) {
 #if defined(WITH_PYTHON)
 	if (handler->python_args != NULL) {
 		struct gattlib_python_args* args = handler->python_args;
-		Py_DECREF(args->callback);
-		Py_DECREF(args->args);
+		if (args->callback != NULL) {
+			Py_DECREF(args->callback);
+		}
+		if (args->args != NULL) {
+			Py_DECREF(args->args);
+		}
 		handler->python_args = NULL;
 		free(handler->python_args);
 		handler->python_args = NULL;

dbus/gattlib.c

@@ -407,7 +407,7 @@ int gattlib_discover_primary(gatt_connection_t* connection, gattlib_primary_serv
 		count_max++;
 	}
 
-	gattlib_primary_service_t* primary_services = malloc(count_max * sizeof(gattlib_primary_service_t));
+	gattlib_primary_service_t* primary_services = calloc(count_max * sizeof(gattlib_primary_service_t), 1);
 	if (primary_services == NULL) {
 		return GATTLIB_OUT_OF_MEMORY;
 	}
@@ -497,7 +497,7 @@ int gattlib_discover_primary(gatt_connection_t* connection, gattlib_primary_serv
 		count_max++;
 	}
 
-	gattlib_primary_service_t* primary_services = malloc(count_max * sizeof(gattlib_primary_service_t));
+	gattlib_primary_service_t* primary_services = calloc(count_max * sizeof(gattlib_primary_service_t), 1);
 	if (primary_services == NULL) {
 		return GATTLIB_OUT_OF_MEMORY;
 	}
@@ -667,7 +667,7 @@ int gattlib_discover_char_range(gatt_connection_t* connection, uint16_t start, u
 	}
 
 
-	gattlib_characteristic_t* characteristic_list = malloc(count_max * sizeof(gattlib_characteristic_t));
+	gattlib_characteristic_t* characteristic_list = calloc(count_max * sizeof(gattlib_characteristic_t), 1);
 	if (characteristic_list == NULL) {
 		return GATTLIB_OUT_OF_MEMORY;
 	}
@@ -889,7 +889,7 @@ int gattlib_discover_char_range(gatt_connection_t* connection, uint16_t start, u
 		count_max++;
 	}
 
-	gattlib_characteristic_t* characteristic_list = malloc(count_max * sizeof(gattlib_characteristic_t));
+	gattlib_characteristic_t* characteristic_list = calloc(count_max * sizeof(gattlib_characteristic_t), 1);
 	if (characteristic_list == NULL) {
 		return GATTLIB_OUT_OF_MEMORY;
 	}

dbus/gattlib_notification.c

@@ -181,7 +181,7 @@ static int connect_signal_to_characteristic_uuid(gatt_connection_t* connection,
 	}
 
 	// Add signal to the list
-	struct gattlib_notification_handle *notification_handle = malloc(sizeof(struct gattlib_notification_handle));
+	struct gattlib_notification_handle *notification_handle = calloc(sizeof(struct gattlib_notification_handle), 1);
 	if (notification_handle == NULL) {
 		return GATTLIB_OUT_OF_MEMORY;
 	}

examples/ble_scan/ble_scan.c

@@ -117,7 +117,7 @@ static void ble_discovered_device(void *adapter, const char* addr, const char* n
 		printf("Discovered %s\n", addr);
 	}
 
-	connection = malloc(sizeof(struct connection_t));
+	connection = calloc(sizeof(struct connection_t), 1);
 	if (connection == NULL) {
 		GATTLIB_LOG(GATTLIB_ERROR, "Failt to allocate connection.");
 		return;