3.2-stable review patch. If anyone has any objections, please let me know.
------------------
From: Felix Fietkau <n...@openwrt.org>
commit 8c6e30936a7893a85f6222084f0f26aceb81137a 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 <n...@openwrt.org>
Signed-off-by: John W. Linville <linvi...@tuxdriver.com>
[bwh: Backported to 3.2: adjust context]
Signed-off-by: Ben Hutchings <b...@decadent.org.uk>
---
drivers/net/wireless/ath/ath9k/xmit.c | 2 ++
1 file changed, 2 insertions(+)
--- a/drivers/net/wireless/ath/ath9k/xmit.c
+++ b/drivers/net/wireless/ath/ath9k/xmit.c
@@ -288,6 +288,7 @@ static struct ath_buf *ath_tx_get_buffer
}
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);
@@ -1710,6 +1711,7 @@ static void ath_tx_send_normal(struct at
if (tid)
INCR(tid->seq_start, IEEE80211_SEQ_MAX);
+ bf->bf_next = NULL;
bf->bf_lastbf = bf;
ath_tx_fill_desc(sc, bf, txq, fi->framelen);
ath_tx_txqaddbuf(sc, txq, &bf_head, false);
--
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