platform/x86: dell-uart-backlight: fix serdev race

The dell_uart_bl_serdev_probe() function calls devm_serdev_device_open()
before setting the client ops via serdev_device_set_client_ops(). This
ordering can trigger a NULL pointer dereference in the serdev controller's
receive_buf handler, as it assumes serdev->ops is valid when
SERPORT_ACTIVE is set.

This is similar to the issue fixed in commit 5e700b384ec1
("platform/chrome: cros_ec_uart: properly fix race condition") where
devm_serdev_device_open() was called before fully initializing the
device.

Fix the race by ensuring client ops are set before enabling the port via
devm_serdev_device_open().

Note, serdev_device_set_baudrate() and serdev_device_set_flow_control()
calls should be after the devm_serdev_device_open() call.

Fixes: 484bae9e4d6a ("platform/x86: Add new Dell UART backlight driver")
Signed-off-by: Chenyuan Yang <chenyuan0y@gmail.com>
Reviewed-by: Hans de Goede <hdegoede@redhat.com>
Link: https://lore.kernel.org/r/20250111180118.2274516-1-chenyuan0y@gmail.com
Reviewed-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com>
Signed-off-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com>

diff --git a/drivers/platform/x86/dell/dell-uart-backlight.c b/drivers/platform/x86/dell/dell-uart-backlight.c
index 6e5dc7e3674f5a2a4ab0948be76892dbac768985..bcc5c0f3bb4d1e3ddbb12a65719929d28e96f64e 100644 (file)
--- a/drivers/platform/x86/dell/dell-uart-backlight.c
+++ b/drivers/platform/x86/dell/dell-uart-backlight.c
@@ -283,6 +283,9 @@ static int dell_uart_bl_serdev_probe(struct serdev_device *serdev)
        init_waitqueue_head(&dell_bl->wait_queue);
        dell_bl->dev = dev;
 
+       serdev_device_set_drvdata(serdev, dell_bl);
+       serdev_device_set_client_ops(serdev, &dell_uart_bl_serdev_ops);
+
        ret = devm_serdev_device_open(dev, serdev);
        if (ret)
                return dev_err_probe(dev, ret, "opening UART device\n");
@@ -290,8 +293,6 @@ static int dell_uart_bl_serdev_probe(struct serdev_device *serdev)
        /* 9600 bps, no flow control, these are the default but set them to be sure */
        serdev_device_set_baudrate(serdev, 9600);
        serdev_device_set_flow_control(serdev, false);
-       serdev_device_set_drvdata(serdev, dell_bl);
-       serdev_device_set_client_ops(serdev, &dell_uart_bl_serdev_ops);
 
        get_version[0] = DELL_SOF(GET_CMD_LEN);
        get_version[1] = CMD_GET_VERSION;