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

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Message-ID: <78819e4d-6eb1-8a71-2da0-0d4711103648@kernel.org>
Date:   Wed, 31 May 2023 11:03:54 +0200
From:   Konrad Dybcio <konradybcio@...nel.org>
To:     Lu Hongfei <luhongfei@...o.com>, Andy Gross <agross@...nel.org>,
        Bjorn Andersson <andersson@...nel.org>,
        Neil Armstrong <neil.armstrong@...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 31.05.2023 10:54, 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.
> 
> Fixes: 080b4e24852b ("soc: qcom: pmic_glink: Introduce altmode support")
> 
> Signed-off-by: Lu Hongfei <luhongfei@...o.com>
> ---
This is the third revision of this patch, please version them accordingly.

You can pass `-vN` to git format-patch and it'll do the job for you.

Please also describe the changes since last revision below the --- line.

Konrad

>  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[] = {