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[PATCH v2 3.8 2/5] ath9k: fix double-free bug on beacon generate failure

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When the next beacon is sent, the ath_buf from the previous run is reused.
If getting a new beacon from mac80211 fails, bf->bf_mpdu is not reset, yet
the skb is freed, leading to a double-free on the next beacon tx attempt,
resulting in a system crash.

Cc: stable@xxxxxxxxxxxxxxx
Signed-off-by: Felix Fietkau <nbd@xxxxxxxxxxx>
---
 drivers/net/wireless/ath/ath9k/beacon.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/net/wireless/ath/ath9k/beacon.c b/drivers/net/wireless/ath/ath9k/beacon.c
index 531fffd..4eb269d 100644
--- a/drivers/net/wireless/ath/ath9k/beacon.c
+++ b/drivers/net/wireless/ath/ath9k/beacon.c
@@ -147,6 +147,7 @@ static struct ath_buf *ath9k_beacon_generate(struct ieee80211_hw *hw,
 				 skb->len, DMA_TO_DEVICE);
 		dev_kfree_skb_any(skb);
 		bf->bf_buf_addr = 0;
+		bf->bf_mpdu = NULL;
 	}
 
 	skb = ieee80211_beacon_get(hw, vif);
-- 
1.8.0.2

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