From 28a1bcdb57d50f3038a255741ecc83e391e5282e Mon Sep 17 00:00:00 2001 From: Johannes Berg Date: Tue, 4 Oct 2011 18:27:10 +0200 Subject: [PATCH] mac80211: fix offchannel TX cookie matching When I introduced in-kernel off-channel TX I introduced a bug -- the work can't be canceled again because the code clear the skb pointer. Fix this by keeping track separately of whether TX status has already been reported. Cc: stable@kernel.org [2.6.38+] Reported-by: Jouni Malinen Tested-by: Jouni Malinen Signed-off-by: Johannes Berg Signed-off-by: John W. Linville --- net/mac80211/cfg.c | 2 +- net/mac80211/ieee80211_i.h | 1 + net/mac80211/status.c | 2 +- net/mac80211/work.c | 2 +- 4 files changed, 4 insertions(+), 3 deletions(-) diff --git a/net/mac80211/cfg.c b/net/mac80211/cfg.c index 1309bb9..d0705f2 100644 --- a/net/mac80211/cfg.c +++ b/net/mac80211/cfg.c @@ -1886,7 +1886,7 @@ ieee80211_offchan_tx_done(struct ieee80211_work *wk, struct sk_buff *skb) * so in that case userspace will have to deal with it. */ - if (wk->offchan_tx.wait && wk->offchan_tx.frame) + if (wk->offchan_tx.wait && !wk->offchan_tx.status) cfg80211_mgmt_tx_status(wk->sdata->dev, (unsigned long) wk->offchan_tx.frame, wk->ie, wk->ie_len, false, GFP_KERNEL); diff --git a/net/mac80211/ieee80211_i.h b/net/mac80211/ieee80211_i.h index 9fa5f8a..810d7b6 100644 --- a/net/mac80211/ieee80211_i.h +++ b/net/mac80211/ieee80211_i.h @@ -346,6 +346,7 @@ struct ieee80211_work { struct { struct sk_buff *frame; u32 wait; + bool status; } offchan_tx; }; diff --git a/net/mac80211/status.c b/net/mac80211/status.c index 864a9c3..f3d7107 100644 --- a/net/mac80211/status.c +++ b/net/mac80211/status.c @@ -429,7 +429,7 @@ void ieee80211_tx_status(struct ieee80211_hw *hw, struct sk_buff *skb) continue; if (wk->offchan_tx.frame != skb) continue; - wk->offchan_tx.frame = NULL; + wk->offchan_tx.status = true; break; } rcu_read_unlock(); diff --git a/net/mac80211/work.c b/net/mac80211/work.c index af374fa..94472eb 100644 --- a/net/mac80211/work.c +++ b/net/mac80211/work.c @@ -577,7 +577,7 @@ ieee80211_offchannel_tx(struct ieee80211_work *wk) /* * After this, offchan_tx.frame remains but now is no * longer a valid pointer -- we still need it as the - * cookie for canceling this work. + * cookie for canceling this work/status matching. */ ieee80211_tx_skb(wk->sdata, wk->offchan_tx.frame); -- 2.7.4