From: Johannes Berg Date: Fri, 20 Nov 2009 08:15:51 +0000 (+0100) Subject: mac80211: fix two remote exploits X-Git-Tag: v2.6.32~30^2~1 X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=4253119acf412fd686ef4bd8749b5a4d70ea3a51;p=platform%2Fkernel%2Flinux-stable.git mac80211: fix two remote exploits Lennert Buytenhek noticed a remotely triggerable problem in mac80211, which is due to some code shuffling I did that ended up changing the order in which things were done -- this was in commit d75636ef9c1af224f1097941879d5a8db7cd04e5 Author: Johannes Berg Date: Tue Feb 10 21:25:53 2009 +0100 mac80211: RX aggregation: clean up stop session The problem is that the BUG_ON moved before the various checks, and as such can be triggered. As the comment indicates, the BUG_ON can be removed since the ampdu_action callback must already exist when the state is OPERATIONAL. A similar code path leads to a WARN_ON in ieee80211_stop_tx_ba_session, which can also be removed. Cc: stable@kernel.org [2.6.29+] Cc: Lennert Buytenhek Signed-off-by: Johannes Berg Signed-off-by: John W. Linville --- diff --git a/net/mac80211/agg-rx.c b/net/mac80211/agg-rx.c index bc064d7..ce8e0e7 100644 --- a/net/mac80211/agg-rx.c +++ b/net/mac80211/agg-rx.c @@ -85,10 +85,6 @@ void ieee80211_sta_stop_rx_ba_session(struct ieee80211_sub_if_data *sdata, u8 *r struct ieee80211_local *local = sdata->local; struct sta_info *sta; - /* stop HW Rx aggregation. ampdu_action existence - * already verified in session init so we add the BUG_ON */ - BUG_ON(!local->ops->ampdu_action); - rcu_read_lock(); sta = sta_info_get(local, ra); diff --git a/net/mac80211/agg-tx.c b/net/mac80211/agg-tx.c index 206fd82..63224d1ee 100644 --- a/net/mac80211/agg-tx.c +++ b/net/mac80211/agg-tx.c @@ -545,7 +545,7 @@ int ieee80211_stop_tx_ba_session(struct ieee80211_hw *hw, struct sta_info *sta; int ret = 0; - if (WARN_ON(!local->ops->ampdu_action)) + if (!local->ops->ampdu_action) return -EINVAL; if (tid >= STA_TID_NUM)