diff options
| author | Felix Fietkau <nbd@openwrt.org> | 2011-01-24 19:28:49 +0100 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@suse.de> | 2011-02-17 15:13:51 -0800 |
| commit | 04e0f5f7ed4fe711325d4d62b80f1f2031db9614 (patch) | |
| tree | 6196f296db8f4705a36166fb64d19316a842fa4a /net | |
| parent | 4408bef5c1cd09328dc7944f8460b6ec6ba52564 (diff) | |
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>
Diffstat (limited to 'net')
| -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 7a637b80a62e..e2d33cf0c407 100644 --- a/net/mac80211/tx.c +++ b/net/mac80211/tx.c @@ -2207,6 +2207,9 @@ 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) |