linux-kernel - Re: [PATCH] net: mac80211: tx.c: be sure of 'sdata->vif.type' must be NL80211_IFTYPE_AP when be in NL80211_IFTYPE

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Message-ID: <1385890523.4171.1.camel@jlt4.sipsolutions.net>
Date:	Sun, 01 Dec 2013 10:35:23 +0100
From:	Johannes Berg <johannes@...solutions.net>
To:	Joe Perches <joe@...ches.com>
Cc:	Chen Gang <gang.chen.5i5j@...il.com>,
	"John W. Linville" <linville@...driver.com>,
	rkuo <rkuo@...eaurora.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	David Miller <davem@...emloft.net>,
	linux-wireless@...r.kernel.org, netdev <netdev@...r.kernel.org>
Subject: Re: [PATCH] net: mac80211: tx.c: be sure of 'sdata->vif.type' must
 be NL80211_IFTYPE_AP when be in NL80211_IFTYPE_AP case

On Sat, 2013-11-30 at 12:39 -0800, Joe Perches wrote:

> +++ b/net/mac80211/tx.c
> @@ -1777,18 +1777,16 @@ netdev_tx_t ieee80211_subif_start_xmit(struct sk_buff *skb,
>  		}
>  		ap_sdata = container_of(sdata->bss, struct ieee80211_sub_if_data,
>  					u.ap);
> -		chanctx_conf = rcu_dereference(ap_sdata->vif.chanctx_conf);
> -		if (!chanctx_conf)
> -			goto fail_rcu;
> -		band = chanctx_conf->def.chan->band;
> -		if (sta)
> -			break;
>  		/* fall through */
>  	case NL80211_IFTYPE_AP:
> -		if (sdata->vif.type == NL80211_IFTYPE_AP)
> -			chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
> +		chanctx_conf = rcu_dereference(ap_sdata->vif.chanctx_conf);

Good try, but no, now ap_sdata isn't even assigned. :)

johannes

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