tree 7c107dadb64f044c7747c41e369f9780ab611cb1
parent bdc4bf652bc0271ba8f1f25bbd3dbac90bead44e
author Felix Fietkau <nbd@openwrt.org> 1295893729 +0100
committer John W. Linville <linville@tuxdriver.com> 1295990936 -0500

mac80211: fix a crash in ieee80211_beacon_get_tim on change_interface

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>
Cc: stable@kernel.org
Signed-off-by: John W. Linville <linville@tuxdriver.com>