linux-kernel - Re: [PATCH] soc: qcom: pmic: Fix resource leaks in device_for_each_child

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Message-ID: <7c1a43ee-d0ca-3deb-24e5-0423a188b459@quicinc.com>
Date:   Wed, 31 May 2023 13:48:02 +0530
From:   Mukesh Ojha <quic_mojha@...cinc.com>
To:     Lu Hongfei <luhongfei@...o.com>, Andy Gross <agross@...nel.org>,
        Bjorn Andersson <andersson@...nel.org>,
        Konrad Dybcio <konrad.dybcio@...aro.org>,
        "open list:ARM/QUALCOMM SUPPORT" <linux-arm-msm@...r.kernel.org>,
        open list <linux-kernel@...r.kernel.org>
CC:     <opensource.kernel@...o.com>
Subject: Re: [PATCH] soc: qcom: pmic: Fix resource leaks in
 device_for_each_child_node() loops



On 5/31/2023 1:25 PM, Lu Hongfei wrote:
> The device_for_each_child_node loop in pmic_glink_altmode_probe should have
> fwnode_handle_put() before return which could avoid resource leaks.
> This patch could fix this bug.
> 
> Signed-off-by: Lu Hongfei <luhongfei@...o.com>

Use  Fixes: tag

Otherwise LGTM.

Reviewed-by: Mukesh Ojha <quic_mojha@...cinc.com>

-- Mukesh

> ---
>   drivers/soc/qcom/pmic_glink_altmode.c | 27 ++++++++++++++++++---------
>   1 file changed, 18 insertions(+), 9 deletions(-)
> 
> diff --git a/drivers/soc/qcom/pmic_glink_altmode.c b/drivers/soc/qcom/pmic_glink_altmode.c
> index df48fbea4b68..a7fc6570fa1e
> --- a/drivers/soc/qcom/pmic_glink_altmode.c
> +++ b/drivers/soc/qcom/pmic_glink_altmode.c
> @@ -395,7 +395,7 @@ static int pmic_glink_altmode_probe(struct auxiliary_device *adev,
>   		ret = fwnode_property_read_u32(fwnode, "reg", &port);
>   		if (ret < 0) {
>   			dev_err(dev, "missing reg property of %pOFn\n", fwnode);
> -			return ret;
> +			goto err_node_put;
>   		}
>   
>   		if (port >= ARRAY_SIZE(altmode->ports)) {
> @@ -405,7 +405,8 @@ static int pmic_glink_altmode_probe(struct auxiliary_device *adev,
>   
>   		if (altmode->ports[port].altmode) {
>   			dev_err(dev, "multiple connector definition for port %u\n", port);
> -			return -EINVAL;
> +			ret = -EINVAL;
> +			goto err_node_put;
>   		}
>   
>   		alt_port = &altmode->ports[port];
> @@ -420,33 +421,37 @@ static int pmic_glink_altmode_probe(struct auxiliary_device *adev,
>   
>   		ret = devm_drm_bridge_add(dev, &alt_port->bridge);
>   		if (ret)
> -			return ret;
> +			goto err_node_put;
>   
>   		alt_port->dp_alt.svid = USB_TYPEC_DP_SID;
>   		alt_port->dp_alt.mode = USB_TYPEC_DP_MODE;
>   		alt_port->dp_alt.active = 1;
>   
>   		alt_port->typec_mux = fwnode_typec_mux_get(fwnode);
> -		if (IS_ERR(alt_port->typec_mux))
> -			return dev_err_probe(dev, PTR_ERR(alt_port->typec_mux),
> +		if (IS_ERR(alt_port->typec_mux)) {
> +			ret = dev_err_probe(dev, PTR_ERR(alt_port->typec_mux),
>   					     "failed to acquire mode-switch for port: %d\n",
>   					     port);
> +			goto err_node_put;
> +		}
>   
>   		ret = devm_add_action_or_reset(dev, pmic_glink_altmode_put_mux,
>   					       alt_port->typec_mux);
>   		if (ret)
> -			return ret;
> +			goto err_node_put;
>   
>   		alt_port->typec_switch = fwnode_typec_switch_get(fwnode);
> -		if (IS_ERR(alt_port->typec_switch))
> -			return dev_err_probe(dev, PTR_ERR(alt_port->typec_switch),
> +		if (IS_ERR(alt_port->typec_switch)) {
> +			ret = dev_err_probe(dev, PTR_ERR(alt_port->typec_switch),
>   					     "failed to acquire orientation-switch for port: %d\n",
>   					     port);
> +			goto err_node_put;
> +		}
>   
>   		ret = devm_add_action_or_reset(dev, pmic_glink_altmode_put_switch,
>   					       alt_port->typec_switch);
>   		if (ret)
> -			return ret;
> +			goto err_node_put;
>   	}
>   
>   	altmode->client = devm_pmic_glink_register_client(dev,
> @@ -455,6 +460,10 @@ static int pmic_glink_altmode_probe(struct auxiliary_device *adev,
>   							  pmic_glink_altmode_pdr_notify,
>   							  altmode);
>   	return PTR_ERR_OR_ZERO(altmode->client);
> +
> +err_node_put:
> +	fwnode_handle_put(fwnode);
> +	return ret;
>   }
>   
>   static const struct auxiliary_device_id pmic_glink_altmode_id_table[] = {