linux-kernel - RE: 3.5.0 iwlagn AP crash...

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Date:	Mon, 23 Jul 2012 06:56:33 +0000
From:	"Berg, Johannes" <johannes.berg@...el.com>
To:	Daniel J Blueman <daniel@...ra.org>,
	Intel Linux Wireless <ilw@...ux.intel.com>
CC:	Linux Kernel <linux-kernel@...r.kernel.org>,
	"linux-wireless@...r.kernel.org" <linux-wireless@...r.kernel.org>,
	"gregkh@...uxfoundation.org" <gregkh@...uxfoundation.org>
Subject: RE: 3.5.0 iwlagn AP crash...

> > > BUG: unable to handle kernel NULL pointer dereference at      (null)
> > > IP: [<ffffffffa02e869d>] ieee80211_ave_rssi+0xd/0x50 [mac80211]
> >
> > From my debug kernel, sdata is clearly NULL:
> >
> > (gdb) list *0xffffffff815b74f8
> > 0xffffffff815b74f8 is in ieee80211_ave_rssi (net/mac80211/util.c:1801).
> > 1796	int ieee80211_ave_rssi(struct ieee80211_vif *vif)
> > 1797	{
> > 1798		struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
> 
> I'll look into it, thanks.

We had a fix, but it seems I missed putting it into 3.5:

commit e19ebcab01cc130fa832764d453b263460ec3b91
Author: Ilan Peer <ilan.peer@...el.com>
Date:   Thu May 10 15:53:14 2012 +0300

    iwlwifi: Check BSS ctx active before call mac80211

I'll ask Greg to include it in 3.5 stable.

johannes
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