ath9k: fix stale pointers potentially causing access to free'd skbs

commit 8c6e3093 upstream.

bf->bf_next is only while buffers are chained as part of an A-MPDU
in the tx queue. When a tid queue is flushed (e.g. on tearing down
an aggregation session), frames can be enqueued again as normal
transmission, without bf_next being cleared. This can lead to the
old pointer being dereferenced again later.

This patch might fix crashes and "Failed to stop TX DMA!" messages.
Signed-off-by: Felix Fietkau <nbd@openwrt.org>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/net/wireless/ath/ath9k/xmit.c

@@ -272,6 +272,7 @@ static struct ath_buf *ath_tx_get_buffer(struct ath_softc *sc)
 	}
 
 	bf = list_first_entry(&sc->tx.txbuf, struct ath_buf, list);
+	bf->bf_next = NULL;
 	list_del(&bf->list);
 
 	spin_unlock_bh(&sc->tx.txbuflock);
@@ -1488,6 +1489,7 @@ static void ath_tx_send_normal(struct ath_softc *sc, struct ath_txq *txq,
 	if (tid)
 		INCR(tid->seq_start, IEEE80211_SEQ_MAX);
 
+	bf->bf_next = NULL;
 	bf->bf_lastbf = bf;
 	fi = get_frame_info(bf->bf_mpdu);
 	ath_buf_set_rate(sc, bf, fi->framelen);