netdev - Re: [PATCH] dp83640: don't recieve time stamps twice

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Date:   Wed, 19 Apr 2017 09:16:56 +0000
From:   Sørensen, Stefan 
        <Stefan.Sorensen@...ctralink.com>
To:     "dan.carpenter@...cle.com" <dan.carpenter@...cle.com>,
        "richardcochran@...il.com" <richardcochran@...il.com>
CC:     "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "f.fainelli@...il.com" <f.fainelli@...il.com>,
        "andrew@...n.ch" <andrew@...n.ch>,
        "kernel-janitors@...r.kernel.org" <kernel-janitors@...r.kernel.org>
Subject: Re: [PATCH] dp83640: don't recieve time stamps twice

On Tue, 2017-04-18 at 22:14 +0300, Dan Carpenter wrote:
> This patch is prompted by a static checker warning about a potential
> use after free.  The concern is that netif_rx_ni() can free "skb" and
> we
> call it twice.
> 
> When I look at the commit that added this, it looks like some stray
> lines were added accidentally.  It doesn't make sense to me that we
> would recieve the same data two times.  I asked the author but never
> recieved a response.
> 
> I can't test this code, but I'm pretty sure my patch is correct.

Sorry for not getting back earlier, I have swamped with other stuff.

You are correct that these lines was added accidentally.

Acked-by: Stefan Sørensen <stefan.sorensen@...ctralink.com>

> 
> Fixes: 4b063258ab93 ("dp83640: Delay scheduled work.")
> Signed-off-by: Dan Carpenter <dan.carpenter@...cle.com>
> 
> diff --git a/drivers/net/phy/dp83640.c b/drivers/net/phy/dp83640.c
> index e2460a57e4b1..ed0d10f54f26 100644
> --- a/drivers/net/phy/dp83640.c
> +++ b/drivers/net/phy/dp83640.c
> @@ -1438,8 +1438,6 @@ static bool dp83640_rxtstamp(struct phy_device
> *phydev,
>  		skb_info->tmo = jiffies + SKB_TIMESTAMP_TIMEOUT;
>  		skb_queue_tail(&dp83640->rx_queue, skb);
>  		schedule_delayed_work(&dp83640->ts_work,
> SKB_TIMESTAMP_TIMEOUT);
> -	} else {
> -		netif_rx_ni(skb);
>  	}
>  
>  	return true;