6.10-stable review patch. If anyone has any objections, please let me know.
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From: P Praneesh quic_ppranees@quicinc.com
[ Upstream commit 33322e3ef07409278a18c6919c448e369d66a18e ]
For fragmented packets, ath12k reassembles each fragment as a normal packet and then reinjects it into HW ring. In this case, the DMA direction should be DMA_TO_DEVICE, not DMA_FROM_DEVICE. Otherwise, an invalid payload may be reinjected into the HW and subsequently delivered to the host.
Given that arbitrary memory can be allocated to the skb buffer, knowledge about the data contained in the reinjected buffer is lacking. Consequently, there’s a risk of private information being leaked.
Tested-on: QCN9274 hw2.0 PCI WLAN.WBE.1.1.1-00209-QCAHKSWPL_SILICONZ-1
Fixes: d889913205cf ("wifi: ath12k: driver for Qualcomm Wi-Fi 7 devices") Co-developed-by: Baochen Qiang quic_bqiang@quicinc.com Signed-off-by: Baochen Qiang quic_bqiang@quicinc.com Signed-off-by: P Praneesh quic_ppranees@quicinc.com Acked-by: Jeff Johnson quic_jjohnson@quicinc.com Signed-off-by: Kalle Valo quic_kvalo@quicinc.com Link: https://msgid.link/20240520070045.631029-2-quic_ppranees@quicinc.com Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/net/wireless/ath/ath12k/dp_rx.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/drivers/net/wireless/ath/ath12k/dp_rx.c b/drivers/net/wireless/ath/ath12k/dp_rx.c index e5fb5cb000f04..37e5bca9570fe 100644 --- a/drivers/net/wireless/ath/ath12k/dp_rx.c +++ b/drivers/net/wireless/ath/ath12k/dp_rx.c @@ -3030,7 +3030,7 @@ static int ath12k_dp_rx_h_defrag_reo_reinject(struct ath12k *ar,
buf_paddr = dma_map_single(ab->dev, defrag_skb->data, defrag_skb->len + skb_tailroom(defrag_skb), - DMA_FROM_DEVICE); + DMA_TO_DEVICE); if (dma_mapping_error(ab->dev, buf_paddr)) return -ENOMEM;
@@ -3116,7 +3116,7 @@ static int ath12k_dp_rx_h_defrag_reo_reinject(struct ath12k *ar, spin_unlock_bh(&dp->rx_desc_lock); err_unmap_dma: dma_unmap_single(ab->dev, buf_paddr, defrag_skb->len + skb_tailroom(defrag_skb), - DMA_FROM_DEVICE); + DMA_TO_DEVICE); return ret; }