ath9k: fix stale pointers potentially causing access to free'd skbs
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> Cc: stable@vger.kernel.org Signed-off-by: John W. Linville <linville@tuxdriver.com>
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@ -312,6 +312,7 @@ static struct ath_buf *ath_tx_get_buffer(struct ath_softc *sc)
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}
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bf = list_first_entry(&sc->tx.txbuf, struct ath_buf, list);
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bf->bf_next = NULL;
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list_del(&bf->list);
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spin_unlock_bh(&sc->tx.txbuflock);
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@ -1774,6 +1775,7 @@ static void ath_tx_send_normal(struct ath_softc *sc, struct ath_txq *txq,
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list_add_tail(&bf->list, &bf_head);
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bf->bf_state.bf_type = 0;
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bf->bf_next = NULL;
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bf->bf_lastbf = bf;
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ath_tx_fill_desc(sc, bf, txq, fi->framelen);
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ath_tx_txqaddbuf(sc, txq, &bf_head, false);
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