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mac80211: fix a crash in ieee80211_beacon_get_tim on change_interface

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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>
This commit is contained in:
Felix Fietkau 2011-01-24 19:28:49 +01:00 committed by John W. Linville
parent bdc4bf652b
commit eb3e554b4b
1 changed files with 3 additions and 0 deletions
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3
net/mac80211/tx.c
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@ -2230,6 +2230,9 @@ struct sk_buff *ieee80211_beacon_get_tim(struct ieee80211_hw *hw,
sdata = vif_to_sdata(vif); sdata = vif_to_sdata(vif);
if (!ieee80211_sdata_running(sdata))
goto out;
if (tim_offset) if (tim_offset)
*tim_offset = 0; *tim_offset = 0;
if (tim_length) if (tim_length)