diff options
| author |   Felix Fietkau <nbd@openwrt.org> | 2011-01-24 19:28:49 +0100 |
|---|---|---|
| committer |   John W. Linville <linville@tuxdriver.com> | 2011-01-25 16:28:56 -0500 |
| commit | eb3e554b4b3a56386ef5214dbe0e3935a350178b (patch) | |
| tree | 7c107dadb64f044c7747c41e369f9780ab611cb1 /net/mac80211/tx.c | |
| parent | rtlwifi: Fix possible NULL dereference (diff) | |
| download | linux-dev-eb3e554b4b3a56386ef5214dbe0e3935a350178b.tar.xz linux-dev-eb3e554b4b3a56386ef5214dbe0e3935a350178b.zip | |
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>
Diffstat (limited to '')
| -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 5950e3abead9..b64b42bc774b 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) |