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From: "Stefan Bühler" <stefan.buehler@tik.uni-stuttgart.de>
To: Johannes Berg <johannes@sipsolutions.net>
Cc: linux-wireless@vger.kernel.org, "Stefan Bühler" <source@stbuehler.de>
Subject: Re: [PATCH] cfg80211: fix double-free after changing network namespace
Date: Wed, 4 Dec 2019 09:26:35 +0100
Message-ID: <22d78eff-9975-e2eb-5093-b19f93831bce@tik.uni-stuttgart.de> (raw)
In-Reply-To: <20191126100543.782023-1-stefan.buehler@tik.uni-stuttgart.de>

Hi,

On 11/26/19 11:05 AM, Stefan Bühler wrote:
> From: Stefan Bühler <source@stbuehler.de>
> 
> If wdev->wext.keys was initialized it didn't get reset to NULL on
> unregister (and it doesn't get set in cfg80211_init_wdev either), but
> wdev is reused if unregister was triggered through
> cfg80211_switch_netns.
> 
> The next unregister (for whatever reason) will try to free
> wdev->wext.keys again.
> 
> Signed-off-by: Stefan Bühler <source@stbuehler.de>
> ---
>  net/wireless/core.c | 1 +
>  1 file changed, 1 insertion(+)
> 
> diff --git a/net/wireless/core.c b/net/wireless/core.c
> index 350513744575..3e25229a059d 100644
> --- a/net/wireless/core.c
> +++ b/net/wireless/core.c
> @@ -1102,6 +1102,7 @@ static void __cfg80211_unregister_wdev(struct wireless_dev *wdev, bool sync)
>  
>  #ifdef CONFIG_CFG80211_WEXT
>  	kzfree(wdev->wext.keys);
> +	wdev->wext.keys = NULL;
>  #endif
>  	/* only initialized if we have a netdev */
>  	if (wdev->netdev)
> 

Any status update for this?  Anything I can do?  Should I resubmit this
with "Cc: stable@vger.kernel.org"?

cheers,
Stefan

-- 
Stefan Bühler    Mail/xmpp: stefan.buehler@tik.uni-stuttgart.de
Netze und Kommunikationssysteme der Universität Stuttgart (NKS)
https://www.tik.uni-stuttgart.de/    Telefon: +49 711 685 60854

  parent reply index

Thread overview: 5+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-11-26 10:05 Stefan Bühler
2019-11-26 10:12 ` Stefan Bühler
2019-11-26 15:55   ` Kalle Valo
2019-12-04  8:26 ` Stefan Bühler [this message]
2019-12-04  8:50   ` Johannes Berg

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