linux-kernel - Re: [PATCH] iommu/ipmmu-vmsa: Avoid leak OF node on error

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Message-ID: <Yot13L7XgvxTkgnE@hovoldconsulting.com>
Date:   Mon, 23 May 2022 13:54:04 +0200
From:   Johan Hovold <johan@...nel.org>
To:     cgel.zte@...il.com
Cc:     joro@...tes.org, will@...nel.org, iommu@...ts.linux-foundation.org,
        linux-kernel@...r.kernel.org, Minghao Chi <chi.minghao@....com.cn>,
        Zeal Robot <zealci@....com.cn>
Subject: Re: [PATCH] iommu/ipmmu-vmsa: Avoid leak OF node on error

On Mon, May 23, 2022 at 11:11:45AM +0000, cgel.zte@...il.com wrote:
> From: Minghao Chi <chi.minghao@....com.cn>
> 
> The OF node should be put before returning error in ipmmu_init(),
> otherwise node's refcount will be leaked.
> 
> Reported-by: Zeal Robot <zealci@....com.cn>
> Signed-off-by: Minghao Chi <chi.minghao@....com.cn>
> ---
>  drivers/iommu/ipmmu-vmsa.c | 3 +--
>  1 file changed, 1 insertion(+), 2 deletions(-)
> 
> diff --git a/drivers/iommu/ipmmu-vmsa.c b/drivers/iommu/ipmmu-vmsa.c
> index 8fdb84b3642b..f6440b106f46 100644
> --- a/drivers/iommu/ipmmu-vmsa.c
> +++ b/drivers/iommu/ipmmu-vmsa.c
> @@ -1179,11 +1179,10 @@ static int __init ipmmu_init(void)
>  		return 0;
>  
>  	np = of_find_matching_node(NULL, ipmmu_of_ids);
> +	of_node_put(np);
>  	if (!np)
>  		return 0;
>  
> -	of_node_put(np);
> -
>  	ret = platform_driver_register(&ipmmu_driver);
>  	if (ret < 0)
>  		return ret;

NAK