From: Baochen Qiang <bqiang@codeaurora.org> stable inclusion from stable-5.10.80 commit 461a71a1a62aeb1c92fd5c52d4a93bb5a280cf24 bugzilla: 185821 https://gitee.com/openeuler/kernel/issues/I4L7CG Reference: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=... -------------------------------- [ Upstream commit 86a03dad0f5ad8182ed5fcf7bf3eec71cd96577c ] For fragmented packets, ath11k 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 invalid payload will be reinjected to HW and then delivered to host. What is more, since arbitrary memory could be allocated to the frame, we don't know what kind of data is contained in the buffer reinjected. Thus, as a bad result, private info may be leaked. Note that this issue is only found on Intel platform. Tested-on: QCA6390 hw2.0 PCI WLAN.HST.1.0.1-01740-QCAHSTSWPLZ_V2_TO_X86-1 Signed-off-by: Baochen Qiang <bqiang@codeaurora.org> Signed-off-by: Kalle Valo <kvalo@codeaurora.org> Link: https://lore.kernel.org/r/20210916064617.20006-1-bqiang@codeaurora.org Signed-off-by: Sasha Levin <sashal@kernel.org> Signed-off-by: Chen Jun <chenjun102@huawei.com> Reviewed-by: Weilong Chen <chenweilong@huawei.com> Acked-by: Weilong Chen <chenweilong@huawei.com> Signed-off-by: Chen Jun <chenjun102@huawei.com> Signed-off-by: Zheng Zengkai <zhengzengkai@huawei.com> --- drivers/net/wireless/ath/ath11k/dp_rx.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/drivers/net/wireless/ath/ath11k/dp_rx.c b/drivers/net/wireless/ath/ath11k/dp_rx.c index 2bff8eb507d4..7d6fd8155bb2 100644 --- a/drivers/net/wireless/ath/ath11k/dp_rx.c +++ b/drivers/net/wireless/ath/ath11k/dp_rx.c @@ -3273,7 +3273,7 @@ static int ath11k_dp_rx_h_defrag_reo_reinject(struct ath11k *ar, struct dp_rx_ti 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, paddr)) return -ENOMEM; @@ -3338,7 +3338,7 @@ static int ath11k_dp_rx_h_defrag_reo_reinject(struct ath11k *ar, struct dp_rx_ti spin_unlock_bh(&rx_refill_ring->idr_lock); err_unmap_dma: dma_unmap_single(ab->dev, paddr, defrag_skb->len + skb_tailroom(defrag_skb), - DMA_FROM_DEVICE); + DMA_TO_DEVICE); return ret; } -- 2.20.1