Hi,
On 11-Jan-25 6:35 AM, yangchenyuan wrote:
> From: Chenyuan Yang <chenyuan0y@xxxxxxxxx>
>
> The yt2_1380_fc_serdev_probe() function calls devm_serdev_device_open()
> before it calls serdev_device_set_client_ops(). This can trigger a NULL
> pointer dereference.
> This is similar to 5e700b384ec13f5bcac9855cb28fcc674f1d3593.
>
> Fixes: b2ed33e8d486 ("platform/x86: Add lenovo-yoga-tab2-pro-1380-fastcharger driver")
> Signed-off-by: Chenyuan Yang <chenyuan0y@xxxxxxxxx>
Thank you for your patch.
> ---
> .../platform/x86/lenovo-yoga-tab2-pro-1380-fastcharger.c | 8 ++++----
> 1 file changed, 4 insertions(+), 4 deletions(-)
>
> diff --git a/drivers/platform/x86/lenovo-yoga-tab2-pro-1380-fastcharger.c b/drivers/platform/x86/lenovo-yoga-tab2-pro-1380-fastcharger.c
> index d2699ca24f34..1a4e66464a7e 100644
> --- a/drivers/platform/x86/lenovo-yoga-tab2-pro-1380-fastcharger.c
> +++ b/drivers/platform/x86/lenovo-yoga-tab2-pro-1380-fastcharger.c
> @@ -199,15 +199,15 @@ static int yt2_1380_fc_serdev_probe(struct serdev_device *serdev)
> if (ret)
> return ret;
>
> - ret = devm_serdev_device_open(dev, serdev);
> - if (ret)
> - return dev_err_probe(dev, ret, "opening UART device\n");
> -
> serdev_device_set_baudrate(serdev, 600);
> serdev_device_set_flow_control(serdev, false);
> serdev_device_set_drvdata(serdev, fc);
> serdev_device_set_client_ops(serdev, &yt2_1380_fc_serdev_ops);
>
> + ret = devm_serdev_device_open(dev, serdev);
> + if (ret)
> + return dev_err_probe(dev, ret, "opening UART device\n");
> +
serdev_device_open() resets the termios settings such as flow-control,
so you need to move the serdev_device_set_baudrate() and
serdev_device_set_flow_control() calls to after the new location of
the devm_serdev_device_open() call, just like commit 5e700b384ec1
("platform/chrome: cros_ec_uart: properly fix race condition") does.
Regards,
Hans
> ret = devm_extcon_register_notifier_all(dev, fc->extcon, &fc->nb);
> if (ret)
> return dev_err_probe(dev, ret, "registering extcon notifier\n");
