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mac80211: fix offchannel TX cookie matching

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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 <j@w1.fi>
Tested-by: Jouni Malinen <j@w1.fi>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
This commit is contained in:
Johannes Berg 2011-10-04 18:27:10 +02:00 committed by John W. Linville
parent af4dc88c56
commit 28a1bcdb57
4 changed files with 4 additions and 3 deletions
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2
net/mac80211/cfg.c
View File

@ -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);

1
net/mac80211/ieee80211_i.h
View File

@ -346,6 +346,7 @@ struct ieee80211_work {
struct {
struct sk_buff *frame;
u32 wait;
bool status;
} offchan_tx;
};

2
net/mac80211/status.c
View File

@ -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();

2
net/mac80211/work.c
View File

@ -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);