Re: [PATCH v3 10/11] slimbus: qcom-ngd: Fix kfree() of static memory on setting driver_override

Srinivas Kandagatla
2022-03-01T17:28:30Z

On 27/02/2022 13:53, Krzysztof Kozlowski wrote:
> The driver_override field from platform driver should not be initialized
> from static memory (string literal) because the core later kfree() it,
> for example when driver_override is set via sysfs.
>
> Use dedicated helper to set driver_override properly.
>
> Fixes: 917809e2280b ("slimbus: ngd: Add qcom SLIMBus NGD driver")
> Cc: <stable@vger.kernel.org>
> Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@canonical.com>

LGTM,

Reviewed-by: Srinivas Kandagatla <srinivas.kandagatla@linaro.org>

> ---
> drivers/slimbus/qcom-ngd-ctrl.c | 13 ++++++++++++-
> 1 file changed, 12 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/slimbus/qcom-ngd-ctrl.c b/drivers/slimbus/qcom-ngd-ctrl.c
> index 7040293c2ee8..e5d9fdb81eb0 100644
> --- a/drivers/slimbus/qcom-ngd-ctrl.c
> +++ b/drivers/slimbus/qcom-ngd-ctrl.c
> @@ -1434,6 +1434,7 @@ static int of_qcom_slim_ngd_register(struct device *parent,
> const struct of_device_id *match;
> struct device_node *node;
> u32 id;
> + int ret;
>
> match = of_match_node(qcom_slim_ngd_dt_match, parent->of_node);
> data = match->data;
> @@ -1455,7 +1456,17 @@ static int of_qcom_slim_ngd_register(struct device *parent,
> }
> ngd->id = id;
> ngd->pdev->dev.parent = parent;
> - ngd->pdev->driver_override = QCOM_SLIM_NGD_DRV_NAME;
> +
> + ret = driver_set_override(&ngd->pdev->dev,
> + &ngd->pdev->driver_override,
> + QCOM_SLIM_NGD_DRV_NAME,
> + strlen(QCOM_SLIM_NGD_DRV_NAME));
> + if (ret) {
> + platform_device_put(ngd->pdev);
> + kfree(ngd);
> + of_node_put(node);
> + return ret;
> + }
> ngd->pdev->dev.of_node = node;
> ctrl->ngd = ngd;
>