netdev - Re: [PATCH] net: mv643xx_eth: fix an OF node reference leak

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Message-ID: <6fa9d756-633c-4323-b205-47040f403f57@pf.is.s.u-tokyo.ac.jp>
Date: Mon, 16 Dec 2024 13:24:37 +0900
From: Joe Hattori <joe@...is.s.u-tokyo.ac.jp>
To: sebastian.hesselbarth@...il.com, andrew+netdev@...n.ch,
 davem@...emloft.net, edumazet@...gle.com, kuba@...nel.org, pabeni@...hat.com
Cc: netdev@...r.kernel.org
Subject: Re: [PATCH] net: mv643xx_eth: fix an OF node reference leak

Please disregard this patch as I sent a v2 patch.

On 12/16/24 13:15, Joe Hattori wrote:
> Current implementation of mv643xx_eth_shared_of_add_port() calls
> of_parse_phandle(), but does not release the refcount on error. Call
> of_node_put() in the error path and in mv643xx_eth_shared_of_remove().
> 
> This bug was found by an experimental static analysis tool that I am
> developing.
> 
> Fixes: 76723bca2802 ("net: mv643xx_eth: add DT parsing support")
> Signed-off-by: Joe Hattori <joe@...is.s.u-tokyo.ac.jp>
> ---
>   drivers/net/ethernet/marvell/mv643xx_eth.c | 11 +++++++++--
>   1 file changed, 9 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/net/ethernet/marvell/mv643xx_eth.c b/drivers/net/ethernet/marvell/mv643xx_eth.c
> index a06048719e84..fa30f8c4a0cc 100644
> --- a/drivers/net/ethernet/marvell/mv643xx_eth.c
> +++ b/drivers/net/ethernet/marvell/mv643xx_eth.c
> @@ -2705,8 +2705,11 @@ static struct platform_device *port_platdev[3];
>   static void mv643xx_eth_shared_of_remove(void)
>   {
>   	int n;
> +	struct mv643xx_eth_platform_data *pd;
>   
>   	for (n = 0; n < 3; n++) {
> +		pd = dev_get_platdata(&port_platdev[n]->dev);
> +		of_node_put(pd->phy_node);
>   		platform_device_del(port_platdev[n]);
>   		port_platdev[n] = NULL;
>   	}
> @@ -2769,8 +2772,10 @@ static int mv643xx_eth_shared_of_add_port(struct platform_device *pdev,
>   	}
>   
>   	ppdev = platform_device_alloc(MV643XX_ETH_NAME, dev_num);
> -	if (!ppdev)
> -		return -ENOMEM;
> +	if (!ppdev) {
> +		ret = -ENOMEM;
> +		goto put_err;
> +	}
>   	ppdev->dev.coherent_dma_mask = DMA_BIT_MASK(32);
>   	ppdev->dev.of_node = pnp;
>   
> @@ -2792,6 +2797,8 @@ static int mv643xx_eth_shared_of_add_port(struct platform_device *pdev,
>   
>   port_err:
>   	platform_device_put(ppdev);
> +put_err:
> +	of_node_put(ppd.phy_node);
>   	return ret;
>   }
>   

Best,
Joe