netdev - Re: [PATCH] cfg80211: Fix memory leak

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Date:	Tue, 05 Feb 2013 11:06:06 +0100
From:	Johannes Berg <johannes@...solutions.net>
To:	Larry Finger <Larry.Finger@...inger.net>, mcgrof@...not-panic.com
Cc:	linville@...driver.com, linux-wireless@...r.kernel.org,
	netdev@...r.kernel.org
Subject: Re: [PATCH] cfg80211: Fix memory leak

On Mon, 2013-02-04 at 15:33 -0600, Larry Finger wrote:
> From: Johannes Berg <johannes@...solutions.net>
> 
> When a driver requests a specific regulatory domain after cfg80211 already
> has one, a struct ieee80211_regdomain is leaked.

Thanks Larry!

> Johannes,
> 
> I added a From: for you as the content of this patch is yours.

I changed it back, it's really your patch, I only suggested a bit of the
code :-)

> --- a/net/wireless/reg.c
> +++ b/net/wireless/reg.c
> @@ -2189,10 +2189,14 @@ static int __set_regdom(const struct ieee80211_regdomain *rd)
>  		 * However if a driver requested this specific regulatory
>  		 * domain we keep it for its private use
>  		 */
> -		if (lr->initiator == NL80211_REGDOM_SET_BY_DRIVER)
> +		if (lr->initiator == NL80211_REGDOM_SET_BY_DRIVER) {
> +			const struct ieee80211_regdomain *tmp =
> +						get_wiphy_regdom(request_wiphy);
>  			rcu_assign_pointer(request_wiphy->regd, rd);
> -		else
> +			rcu_free_regdom(tmp);

Luis, when you get back can you please audit the other places? I'm not
convinced that there aren't more places that need to free the regdom,
but I don't really want to dig into the code right now.

johannes

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