From: Felix Fietkau <nbd@openwrt.org>
Date: Mon, 24 Jan 2011 18:28:49 +0000 (+0100)
Subject: mac80211: fix a crash in ieee80211_beacon_get_tim on change_interface
X-Git-Tag: v2.6.37.1~220
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=04e0f5f7ed4fe711325d4d62b80f1f2031db9614;p=pandora-kernel.git

mac80211: fix a crash in ieee80211_beacon_get_tim on change_interface

commit eb3e554b4b3a56386ef5214dbe0e3935a350178b upstream.

Some drivers (e.g. ath9k) do not always disable beacons when they're
supposed to. When an interface is changed using the change_interface op,
the mode specific sdata part is in an undefined state and trying to
get a beacon at this point can produce weird crashes.

To fix this, add a check for ieee80211_sdata_running before using
anything from the sdata.

Signed-off-by: Felix Fietkau <nbd@openwrt.org>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
---

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