linux-kernel - Re: [PATCH] usb: host: Fix refcount leak in ehci_hcd_ppc_of

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Message-ID: <YpjE61Ra0gUMfCW7@rowland.harvard.edu>
Date:   Thu, 2 Jun 2022 10:10:51 -0400
From:   Alan Stern <stern@...land.harvard.edu>
To:     Miaoqian Lin <linmq006@...il.com>
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Vitaly Bordug <vitb@...nel.crashing.org>,
        Stefan Roese <sr@...x.de>, linux-usb@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] usb: host: Fix refcount leak in ehci_hcd_ppc_of_probe

On Thu, Jun 02, 2022 at 03:08:49PM +0400, Miaoqian Lin wrote:
> of_find_compatible_node() 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: 796bcae7361c ("USB: powerpc: Workaround for the PPC440EPX USBH_23 errata [take 3]")
> Signed-off-by: Miaoqian Lin <linmq006@...il.com>
> ---

Acked-by: Alan Stern <stern@...land.harvard.edu>

>  drivers/usb/host/ehci-ppc-of.c | 1 +
>  1 file changed, 1 insertion(+)
> 
> diff --git a/drivers/usb/host/ehci-ppc-of.c b/drivers/usb/host/ehci-ppc-of.c
> index 6bbaee74f7e7..28a19693c19f 100644
> --- a/drivers/usb/host/ehci-ppc-of.c
> +++ b/drivers/usb/host/ehci-ppc-of.c
> @@ -148,6 +148,7 @@ static int ehci_hcd_ppc_of_probe(struct platform_device *op)
>  		} else {
>  			ehci->has_amcc_usb23 = 1;
>  		}
> +		of_node_put(np);
>  	}
>  
>  	if (of_get_property(dn, "big-endian", NULL)) {
> -- 
> 2.25.1
>