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 <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>
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 @@
* 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 {
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 @@
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 @@
/*
* 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);