linux-kernel - Re: [PATCH] media: venus: core: Fix some resource leaks in the error path of 'venus

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Message-ID: <309678ef-c3b9-0269-0715-05a469c04345@linaro.org>
Date:   Thu, 28 Jan 2021 12:49:00 +0200
From:   Georgi Djakov <georgi.djakov@...aro.org>
To:     Christophe JAILLET <christophe.jaillet@...adoo.fr>,
        stanimir.varbanov@...aro.org, agross@...nel.org,
        bjorn.andersson@...aro.org, mchehab@...nel.org
Cc:     linux-media@...r.kernel.org, linux-arm-msm@...ts.infradead.org,
        linux-kernel@...r.kernel.org, kernel-janitors@...r.kernel.org
Subject: Re: [PATCH] media: venus: core: Fix some resource leaks in the error
 path of 'venus_probe()'

Hi Christophe,

Thanks for the fix!

On 1/27/21 22:17, Christophe JAILLET wrote:
> If an error occurs after a successful 'of_icc_get()' call, it must be
> undone by a corresponding 'icc_put()' call.

This works, but why not switch to devm_of_icc_get() instead?

Thanks,
Georgi

> 
> Add it in the error handling path of the probe function as already done in
> the remove function.
> 
> Fixes: 32f0a6ddc8c9 ("media: venus: Use on-chip interconnect API")
> Signed-off-by: Christophe JAILLET <christophe.jaillet@...adoo.fr>
> ---
>   drivers/media/platform/qcom/venus/core.c | 31 +++++++++++++++++-------
>   1 file changed, 22 insertions(+), 9 deletions(-)
> 
> diff --git a/drivers/media/platform/qcom/venus/core.c b/drivers/media/platform/qcom/venus/core.c
> index 0bde19edac86..8fd5da941067 100644
> --- a/drivers/media/platform/qcom/venus/core.c
> +++ b/drivers/media/platform/qcom/venus/core.c
> @@ -200,27 +200,35 @@ static int venus_probe(struct platform_device *pdev)
>   		return PTR_ERR(core->video_path);
>   
>   	core->cpucfg_path = of_icc_get(dev, "cpu-cfg");
> -	if (IS_ERR(core->cpucfg_path))
> -		return PTR_ERR(core->cpucfg_path);
> +	if (IS_ERR(core->cpucfg_path)) {
> +		ret = PTR_ERR(core->cpucfg_path);
> +		goto err_video_path_put;
> +	}
>   
>   	core->irq = platform_get_irq(pdev, 0);
> -	if (core->irq < 0)
> -		return core->irq;
> +	if (core->irq < 0) {
> +		ret = core->irq;
> +		goto err_cpucfg_path_put;
> +	}
>   
>   	core->res = of_device_get_match_data(dev);
> -	if (!core->res)
> -		return -ENODEV;
> +	if (!core->res) {
> +		ret = -ENODEV;
> +		goto err_cpucfg_path_put;
> +	}
>   
>   	mutex_init(&core->pm_lock);
>   
>   	core->pm_ops = venus_pm_get(core->res->hfi_version);
> -	if (!core->pm_ops)
> -		return -ENODEV;
> +	if (!core->pm_ops) {
> +		ret = -ENODEV;
> +		goto err_cpucfg_path_put;
> +	}
>   
>   	if (core->pm_ops->core_get) {
>   		ret = core->pm_ops->core_get(dev);
>   		if (ret)
> -			return ret;
> +			goto err_cpucfg_path_put;
>   	}
>   
>   	ret = dma_set_mask_and_coherent(dev, core->res->dma_mask);
> @@ -305,6 +313,11 @@ static int venus_probe(struct platform_device *pdev)
>   err_core_put:
>   	if (core->pm_ops->core_put)
>   		core->pm_ops->core_put(dev);
> +err_cpucfg_path_put:
> +	icc_put(core->cpucfg_path);
> +err_video_path_put:
> +	icc_put(core->video_path);
> +
>   	return ret;
>   }
>   
>