linux-kernel - Re: [PATCH v3] clocksource: clps711x: Fix resource leaks in error paths

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Message-ID: <395ffd35-65ef-44e7-82ee-25cd64ea4111@linaro.org>
Date: Wed, 13 Aug 2025 14:14:28 +0200
From: Daniel Lezcano <daniel.lezcano@...aro.org>
To: Zhen Ni <zhen.ni@...ystack.cn>, Markus.Elfring@....de, tglx@...utronix.de
Cc: linux-kernel@...r.kernel.org, stable@...r.kernel.org
Subject: Re: [PATCH v3] clocksource: clps711x: Fix resource leaks in error
 paths


Hi,

this patch does not seem to have reached lkml@, making impossible to 
extract via git b4 neither adding the Link tag.



On 05/08/2025 05:56, Zhen Ni wrote:
> The current implementation of clps711x_timer_init() has multiple error
> paths that directly return without releasing the base I/O memory mapped
> via of_iomap(). Fix of_iomap leaks in error paths.
> 
> Fixes: 04410efbb6bc ("clocksource/drivers/clps711x: Convert init function to return error")
> Fixes: 2a6a8e2d9004 ("clocksource/drivers/clps711x: Remove board support")
> Cc: stable@...r.kernel.org
> Signed-off-by: Zhen Ni <zhen.ni@...ystack.cn>
> ---
> changes in v3:
> - Change "err" to "error" in the commit message.
> changes in v2:
> - Add tags of 'Fixes' and 'Cc'
> - Reduce detailed enumeration of err paths
> - Omit a pointer check before iounmap()
> - Change goto target from out to unmap_io
> ---
>   drivers/clocksource/clps711x-timer.c | 23 ++++++++++++++++-------
>   1 file changed, 16 insertions(+), 7 deletions(-)
> 
> diff --git a/drivers/clocksource/clps711x-timer.c b/drivers/clocksource/clps711x-timer.c
> index e95fdc49c226..bbceb0289d45 100644
> --- a/drivers/clocksource/clps711x-timer.c
> +++ b/drivers/clocksource/clps711x-timer.c
> @@ -78,24 +78,33 @@ static int __init clps711x_timer_init(struct device_node *np)
>   	unsigned int irq = irq_of_parse_and_map(np, 0);
>   	struct clk *clock = of_clk_get(np, 0);
>   	void __iomem *base = of_iomap(np, 0);
> +	int ret = 0;
>   
>   	if (!base)
>   		return -ENOMEM;
> -	if (!irq)
> -		return -EINVAL;
> -	if (IS_ERR(clock))
> -		return PTR_ERR(clock);
> +	if (!irq) {
> +		ret = -EINVAL;
> +		goto unmap_io;
> +	}
> +	if (IS_ERR(clock)) {
> +		ret = PTR_ERR(clock);
> +		goto unmap_io;
> +	}
>   
>   	switch (of_alias_get_id(np, "timer")) {
>   	case CLPS711X_CLKSRC_CLOCKSOURCE:
>   		clps711x_clksrc_init(clock, base);
>   		break;
>   	case CLPS711X_CLKSRC_CLOCKEVENT:
> -		return _clps711x_clkevt_init(clock, base, irq);
> +		ret =  _clps711x_clkevt_init(clock, base, irq);
> +		break;
>   	default:
> -		return -EINVAL;
> +		ret = -EINVAL;
> +		break;
>   	}
>   
> -	return 0;
> +unmap_io:
> +	iounmap(base);
> +	return ret;
>   }
>   TIMER_OF_DECLARE(clps711x, "cirrus,ep7209-timer", clps711x_timer_init);


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