diff options
| author | Felix Fietkau <nbd@openwrt.org> | 2011-01-24 18:28:49 (GMT) |
|---|---|---|
| committer | John W. Linville <linville@tuxdriver.com> | 2011-01-25 21:28:56 (GMT) |
| commit | eb3e554b4b3a56386ef5214dbe0e3935a350178b (patch) | |
| tree | 7c107dadb64f044c7747c41e369f9780ab611cb1 | |
| parent | bdc4bf652bc0271ba8f1f25bbd3dbac90bead44e (diff) | |
| download | linux-eb3e554b4b3a56386ef5214dbe0e3935a350178b.tar.xz | |
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>
| -rw-r--r-- | net/mac80211/tx.c | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/net/mac80211/tx.c b/net/mac80211/tx.c index 5950e3a..b64b42b 100644 --- a/net/mac80211/tx.c +++ b/net/mac80211/tx.c @@ -2230,6 +2230,9 @@ struct sk_buff *ieee80211_beacon_get_tim(struct ieee80211_hw *hw, sdata = vif_to_sdata(vif); + if (!ieee80211_sdata_running(sdata)) + goto out; + if (tim_offset) *tim_offset = 0; if (tim_length) |