linux-kernel - Re: [PATCH] sparc32,leon: Fix reference leak in leon_ipi

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Date:   Sun, 5 Jun 2022 09:48:12 +0200
From:   Sam Ravnborg <sam@...nborg.org>
To:     Miaoqian Lin <linmq006@...il.com>
Cc:     "David S. Miller" <davem@...emloft.net>,
        Daniel Hellstrom <daniel@...sler.com>,
        sparclinux@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] sparc32,leon: Fix reference leak in leon_ipi_init

On Sun, Jun 05, 2022 at 09:29:41AM +0400, Miaoqian Lin wrote:
> of_find_node_by_path() returns a node pointer with
> refcount incremented, we should use of_node_put() on it when done.
> Add missing of_node_put() to avoid refcount leak.
> 
> Fixes: 1ca0c808c60f ("sparc32,leon: Implemented SMP IPIs for LEON CPU")
> Signed-off-by: Miaoqian Lin <linmq006@...il.com>

The patch is finei, thanks:
Acked-by: Sam Ravnborg <sam@...nborg.org>

All other uses of of_find_node_by_path() in sparc has the same issue.
Could you try to take a look at the rest too?

	Sam
> ---
>  arch/sparc/kernel/leon_smp.c | 1 +
>  1 file changed, 1 insertion(+)
> 
> diff --git a/arch/sparc/kernel/leon_smp.c b/arch/sparc/kernel/leon_smp.c
> index 1eed26d423fb..85b22669c002 100644
> --- a/arch/sparc/kernel/leon_smp.c
> +++ b/arch/sparc/kernel/leon_smp.c
> @@ -284,6 +284,7 @@ static void __init leon_ipi_init(void)
>  		pp = of_find_property(rootnp, "ipi_num", &len);
>  		if (pp && (*(int *)pp->value))
>  			leon_ipi_irq = *(int *)pp->value;
> +		of_node_put(rootnp);
>  	}
>  	printk(KERN_INFO "leon: SMP IPIs at IRQ %d\n", leon_ipi_irq);
>  
> -- 
> 2.25.1