linux-kernel - Re: [PATCH] cxl: Fix refcount leak in cxl_calc_capp

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Date:   Tue, 7 Jun 2022 11:05:21 +0200
From:   Frederic Barrat <fbarrat@...ux.ibm.com>
To:     Miaoqian Lin <linmq006@...il.com>,
        Andrew Donnellan <ajd@...ux.ibm.com>,
        Arnd Bergmann <arnd@...db.de>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Michael Ellerman <mpe@...erman.id.au>,
        Christophe Lombard <clombard@...ux.vnet.ibm.com>,
        linuxppc-dev@...ts.ozlabs.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] cxl: Fix refcount leak in cxl_calc_capp_routing



On 05/06/2022 08:00, Miaoqian Lin wrote:
> of_get_next_parent() returns a node pointer with refcount incremented,
> we should use of_node_put() on it when not need anymore.
> This function only calls of_node_put() in normal path,
> missing it in the error path.
> Add missing of_node_put() to avoid refcount leak.
> 
> Fixes: f24be42aab37 ("cxl: Add psl9 specific code")
> Signed-off-by: Miaoqian Lin <linmq006@...il.com>


Indeed. Thanks!
Acked-by: Frederic Barrat <fbarrat@...ux.ibm.com>

   Fred


> ---
>   drivers/misc/cxl/pci.c | 1 +
>   1 file changed, 1 insertion(+)
> 
> diff --git a/drivers/misc/cxl/pci.c b/drivers/misc/cxl/pci.c
> index 3de0aea62ade..62385a529d86 100644
> --- a/drivers/misc/cxl/pci.c
> +++ b/drivers/misc/cxl/pci.c
> @@ -387,6 +387,7 @@ int cxl_calc_capp_routing(struct pci_dev *dev, u64 *chipid,
>   	rc = get_phb_index(np, phb_index);
>   	if (rc) {
>   		pr_err("cxl: invalid phb index\n");
> +		of_node_put(np);
>   		return rc;
>   	}
>