linux-kernel - Re: [PATCH 2/2] NET: wireless, fix memory leak

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Date:	Wed, 06 Jan 2010 20:07:48 +0100
From:	Gertjan van Wingerde <gwingerde@...il.com>
To:	Jiri Slaby <jslaby@...e.cz>
CC:	linville@...driver.com, linux-wireless@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/2] NET: wireless, fix memory leak

On 01/06/10 17:35, Jiri Slaby wrote:
> Stanse found a memory leak in cfg80211_wext_siwscan. creq is not
> freed/assigned on all paths. Fix that.
> 
> Signed-off-by: Jiri Slaby <jslaby@...e.cz>
> ---
>  net/wireless/scan.c |    7 +++++--
>  1 files changed, 5 insertions(+), 2 deletions(-)
> 
> diff --git a/net/wireless/scan.c b/net/wireless/scan.c
> index 9c50c85..3003d13 100644
> --- a/net/wireless/scan.c
> +++ b/net/wireless/scan.c
> @@ -685,7 +685,7 @@ int cfg80211_wext_siwscan(struct net_device *dev,
>  	/* No channels found? */
>  	if (!i) {
>  		err = -EINVAL;
> -		goto out;
> +		goto out_free;
>  	}
>  
>  	/* Set real number of channels specified in creq->channels[] */
> @@ -696,7 +696,7 @@ int cfg80211_wext_siwscan(struct net_device *dev,
>  		if (wrqu->data.flags & IW_SCAN_THIS_ESSID) {
>  			if (wreq->essid_len > IEEE80211_MAX_SSID_LEN) {
>  				err = -EINVAL;
> -				goto out;
> +				goto out_free;
>  			}
>  			memcpy(creq->ssids[0].ssid, wreq->essid, wreq->essid_len);
>  			creq->ssids[0].ssid_len = wreq->essid_len;
> @@ -717,6 +717,9 @@ int cfg80211_wext_siwscan(struct net_device *dev,
>   out:
>  	cfg80211_unlock_rdev(rdev);
>  	return err;
> +out_free:
> +	kfree(creq);
> +	goto out;
>  }
>  EXPORT_SYMBOL_GPL(cfg80211_wext_siwscan);
>  

This last part looks a bit strange. Why don't you put out_free label before out label,
and let it continue after the kfree, instead of jumping back to the out label.

---
Gertjan.

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