linux-kernel - Re: [PATCH] char: hw_random: Fix a reference count leak.

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Date:   Mon, 15 Jun 2020 15:18:54 +0200
From:   Lukasz Stelmach <l.stelmach@...sung.com>
To:     wu000273@....edu, Herbert Xu <herbert@...dor.apana.org.au>
Cc:     kjlu@....edu, Matt Mackall <mpm@...enic.com>,
        Arnd Bergmann <arnd@...db.de>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Kukjin Kim <kgene@...nel.org>,
        Krzysztof Kozlowski <krzk@...nel.org>,
        Philippe Ombredanne <pombredanne@...b.com>,
        linux-samsung-soc@...r.kernel.org, linux-crypto@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] char: hw_random: Fix a reference count leak.

It was <2020-06-13 sob 16:41>, when wu000273@....edu wrote:
> From: Qiushi Wu <wu000273@....edu>
>
> Calling pm_runtime_get_sync increments the counter even in case of
> failure, causing incorrect ref count if pm_runtime_put_sync is not
> called in error handling paths. Thus replace the jump target
> "err_pm_get" by "err_clock".
>
> Fixes: 6cd225cc5d8a ("hwrng: exynos - add Samsung Exynos True RNG driver")
> Signed-off-by: Qiushi Wu <wu000273@....edu>
> ---
>  drivers/char/hw_random/exynos-trng.c | 4 +---
>  1 file changed, 1 insertion(+), 3 deletions(-)
>
> diff --git a/drivers/char/hw_random/exynos-trng.c b/drivers/char/hw_random/exynos-trng.c
> index 8e1fe3f8dd2d..ffa7e0f061f0 100644
> --- a/drivers/char/hw_random/exynos-trng.c
> +++ b/drivers/char/hw_random/exynos-trng.c
> @@ -135,7 +135,7 @@ static int exynos_trng_probe(struct platform_device *pdev)
>  	ret = pm_runtime_get_sync(&pdev->dev);
>  	if (ret < 0) {
>  		dev_err(&pdev->dev, "Could not get runtime PM.\n");
> -		goto err_pm_get;
> +		goto err_clock;
>  	}
>  
>  	trng->clk = devm_clk_get(&pdev->dev, "secss");
> @@ -166,8 +166,6 @@ static int exynos_trng_probe(struct platform_device *pdev)
>  
>  err_clock:
>  	pm_runtime_put_sync(&pdev->dev);
> -
> -err_pm_get:
>  	pm_runtime_disable(&pdev->dev);
>  
>  	return ret;

I believe this fix has already been submitted

    https://lore.kernel.org/linux-arm-kernel/20200522011659.26727-1-dinghao.liu@zju.edu.cn/T/#u

It hasn't been applied though. Anyway, thank you for your work.

Herbert, could you take a look at the Dinghao's patch, please?
-- 
Łukasz Stelmach
Samsung R&D Institute Poland
Samsung Electronics

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