netdev - Re: [PATCH v2] net: mv643xx_eth: fix an OF node reference leak

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Message-ID: <d507355d-64b9-4aab-9614-de7339118412@stanley.mountain>
Date: Tue, 17 Dec 2024 17:05:08 +0300
From: Dan Carpenter <dan.carpenter@...aro.org>
To: Joe Hattori <joe@...is.s.u-tokyo.ac.jp>
Cc: sebastian.hesselbarth@...il.com, andrew+netdev@...n.ch,
	davem@...emloft.net, edumazet@...gle.com, kuba@...nel.org,
	pabeni@...hat.com, netdev@...r.kernel.org
Subject: Re: [PATCH v2] net: mv643xx_eth: fix an OF node reference leak

On Mon, Dec 16, 2024 at 01:22:47PM +0900, 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>
> ---
> Changes in v2:
> - Insert a null check before accessing the platform data.
> ---
>  drivers/net/ethernet/marvell/mv643xx_eth.c | 12 ++++++++++--
>  1 file changed, 10 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/net/ethernet/marvell/mv643xx_eth.c b/drivers/net/ethernet/marvell/mv643xx_eth.c
> index a06048719e84..917ff7bd43d4 100644
> --- a/drivers/net/ethernet/marvell/mv643xx_eth.c
> +++ b/drivers/net/ethernet/marvell/mv643xx_eth.c
> @@ -2705,8 +2705,12 @@ 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);

You need another NULL check here.  port_platdev[n] can be NULL so
&port_platdev[n]->dev is NULL + 16.  The call to dev_get_platdata()
will crash.

> +		if (pd)
> +			of_node_put(pd->phy_node);
>  		platform_device_del(port_platdev[n]);
>  		port_platdev[n] = NULL;
>  	}

regards,
dan carpenter