diff mbox series

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

Message ID 20220227135329.145862-4-krzysztof.kozlowski@canonical.com (mailing list archive)
State Not Applicable, archived
Headers show
Series Fix broken usage of driver_override (and kfree of static memory) | expand

Commit Message

Krzysztof Kozlowski Feb. 27, 2022, 1:53 p.m. UTC
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>
---
 drivers/slimbus/qcom-ngd-ctrl.c | 13 ++++++++++++-
 1 file changed, 12 insertions(+), 1 deletion(-)

Comments

Srinivas Kandagatla March 1, 2022, 5:28 p.m. UTC | #1
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;
>
diff mbox series

Patch

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;