[PATCH 4.4 126/312] mac80211: fix mgmt-tx abort cookie and leak

[Greg Kroah-Hartman]

From: Johannes Berg <johannes.berg@xxxxxxxxx>

commit e673a65952b4ab045a3e3eb200fdf408004fb4fd upstream.

If a mgmt-tx operation is aborted before it runs, the wrong
cookie is reported back to userspace, and the ack_skb gets
leaked since the frame is freed directly instead of freeing
it using ieee80211_free_txskb(). Fix that.

Fixes: 3b79af973cf4 ("mac80211: stop using pointers as userspace cookies")
Signed-off-by: Johannes Berg <johannes.berg@xxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>

---
 net/mac80211/offchannel.c |    5 ++---
 1 file changed, 2 insertions(+), 3 deletions(-)

--- a/net/mac80211/offchannel.c
+++ b/net/mac80211/offchannel.c
@@ -308,11 +308,10 @@ void ieee80211_roc_notify_destroy(struct
 
 	/* was never transmitted */
 	if (roc->frame) {
-		cfg80211_mgmt_tx_status(&roc->sdata->wdev,
-					(unsigned long)roc->frame,
+		cfg80211_mgmt_tx_status(&roc->sdata->wdev, roc->mgmt_tx_cookie,
 					roc->frame->data, roc->frame->len,
 					false, GFP_KERNEL);
-		kfree_skb(roc->frame);
+		ieee80211_free_txskb(&roc->sdata->local->hw, roc->frame);
 	}
 
 	if (!roc->mgmt_tx_cookie)