linux-kernel - Re: [PATCH v3] arm/mach-at91/pm : fix possible object reference leak

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Date:   Mon, 1 Apr 2019 14:21:33 +0530
From:   Mukesh Ojha <mojha@...eaurora.org>
To:     Peng Hao <peng.hao2@....com.cn>, ludovic.desroches@...rochip.com,
        nicolas.ferre@...rochip.com, alexandre.belloni@...tlin.com
Cc:     linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH v3] arm/mach-at91/pm : fix possible object reference leak


On 4/1/2019 9:56 PM, Peng Hao wrote:
> of_find_device_by_node() takes a reference to the struct device
> when it finds a match via get_device. When returning error we should
> call put_device.
>
> Signed-off-by: Peng Hao <peng.hao2@....com.cn>
> ---
>   arch/arm/mach-at91/pm.c | 6 ++++--
>   1 file changed, 4 insertions(+), 2 deletions(-)
>
> diff --git a/arch/arm/mach-at91/pm.c b/arch/arm/mach-at91/pm.c
> index 51e808a..38511a5 100644
> --- a/arch/arm/mach-at91/pm.c
> +++ b/arch/arm/mach-at91/pm.c
> @@ -591,13 +591,13 @@ static int __init at91_pm_backup_init(void)
>   
>   	np = of_find_compatible_node(NULL, NULL, "atmel,sama5d2-securam");
>   	if (!np)
> -		goto securam_fail;
> +		goto securam_fail_no_get;


s/securam_fail_no_get/securam_fail_no_ref_dev

otherwise looks good.
Reviewed-by: Mukesh Ojha <mojha@...eaurora.org>

Cheers,
-Mukesh


>   
>   	pdev = of_find_device_by_node(np);
>   	of_node_put(np);
>   	if (!pdev) {
>   		pr_warn("%s: failed to find securam device!\n", __func__);
> -		goto securam_fail;
> +		goto securam_fail_no_get;
>   	}
>   
>   	sram_pool = gen_pool_get(&pdev->dev, NULL);
> @@ -620,6 +620,8 @@ static int __init at91_pm_backup_init(void)
>   	return 0;
>   
>   securam_fail:
> +	put_device(&pdev->dev);
> +securam_fail_no_get:
>   	iounmap(pm_data.sfrbu);
>   	pm_data.sfrbu = NULL;
>   	return ret;