linux-kernel - Re: [PATCH] mac80211: fix mesh forwarding when ratelimited too

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Date:	Thu, 30 Dec 2010 09:53:09 +0100
From:	Johannes Berg <johannes@...solutions.net>
To:	Milton Miller <miltonm@....com>
Cc:	"John W. Linville" <linville@...driver.com>,
	Javier Cardona <javier@...ybit.com>,
	"David S. Miller" <davem@...emloft.net>,
	linux-wireless@...r.kernel.org, netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] mac80211: fix mesh forwarding when ratelimited too

On Thu, 2010-12-30 at 02:01 -0600, Milton Miller wrote:
> Commit b51aff057c9d0ef6c529dc25fd9f775faf7b6c63 said:
> 
>     Under memory pressure, the mac80211 mesh code
>     may helpfully print a message that it failed
>     to clone a mesh frame and then will proceed
>     to crash trying to use it anyway. Fix that.
>     
> Avoid the reference whenever the frame copy is unsuccessful
> regardless of the debug message being suppressed or printed.
> 
> Cc: stable@...nel.org [2.6.27+] 
> Signed-off-by: Milton Miller <miltonm@....com>
> ---
> I chose a seperate if vs nesting the ratelimit check to avoid shifting
> the printk further to the right.
> 
> diff --git a/net/mac80211/rx.c b/net/mac80211/rx.c
> index b01e467..e98668f 100644
> --- a/net/mac80211/rx.c
> +++ b/net/mac80211/rx.c
> @@ -1788,11 +1788,11 @@ ieee80211_rx_h_mesh_fwding(struct ieee80211_rx_data *rx)
>  
>  			fwd_skb = skb_copy(skb, GFP_ATOMIC);
>  
> -			if (!fwd_skb && net_ratelimit()) {
> +			if (!fwd_skb && net_ratelimit())
>  				printk(KERN_DEBUG "%s: failed to clone mesh frame\n",
>  						   sdata->name);
> +			if (!fwd_skb)
>  				goto out;
> -			}

Oops, good catch! Thanks.

johannes

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