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[RFCv5 2/2] mac80211: fix WPA with VLAN on AP side with ps-sta

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When sending a broadcast while at least on of the connected stations is
sleeping, it gets queued and send after a DTIM beacon is sent.
If the packet was to be sent on a vlan interface, the vif used for dequeing
from the per-bss queue does not hold the per-vlan sdata. The correct sdata is
required to use the correct per-vlan broadcast/multicast key.

This patch fixes this by restoring the per-vlan sdata using the skb->dev entry.

Signed-off-by: Michael Braun <michael-dev@xxxxxxxxxxxxx>
---
V2: fix compile warning
V3: simplify change
 net/mac80211/tx.c |    1 +
 1 file changed, 1 insertion(+)

diff --git a/net/mac80211/tx.c b/net/mac80211/tx.c
index f476aa6..71385bf 100644
--- a/net/mac80211/tx.c
+++ b/net/mac80211/tx.c
@@ -2785,6 +2785,7 @@ ieee80211_get_buffered_bc(struct ieee80211_hw *hw,
 				cpu_to_le16(IEEE80211_FCTL_MOREDATA);
 		}
 
+		sdata = IEEE80211_DEV_TO_SUB_IF(skb->dev);
 		if (!ieee80211_tx_prepare(sdata, &tx, skb))
 			break;
 		dev_kfree_skb_any(skb);
-- 
1.7.10.4

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