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From: P Praneesh <quic_ppranees@quicinc.com>
To: <ath12k@lists.infradead.org>
CC: <linux-wireless@vger.kernel.org>, P Praneesh <quic_ppranees@quicinc.com>,
        Baochen Qiang <quic_bqiang@quicinc.com>
Subject: [PATCH 1/3] wifi: ath12k: change DMA direction while mapping reinjected packets
Date: Mon, 20 May 2024 12:30:43 +0530
Message-ID: <20240520070045.631029-2-quic_ppranees@quicinc.com>
In-Reply-To: <20240520070045.631029-1-quic_ppranees@quicinc.com>
References: <20240520070045.631029-1-quic_ppranees@quicinc.com>
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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>
---
 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 37205e894afe..2bfcc19d15ea 100644
--- a/drivers/net/wireless/ath/ath12k/dp_rx.c
+++ b/drivers/net/wireless/ath/ath12k/dp_rx.c
@@ -3004,7 +3004,7 @@ 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;
 
@@ -3090,7 +3090,7 @@ 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;
 }
 
-- 
2.25.1