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[75.74.152.49]) by smtp.gmail.com with ESMTPSA id 00721157ae682-7a36e8343d3sm56288377b3.16.2026.04.06.11.46.14 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 06 Apr 2026 11:46:15 -0700 (PDT) From: Joshua Klinesmith To: nbd@nbd.name, lorenzo@kernel.org, ryder.lee@mediatek.com Cc: shayne.chen@mediatek.com, sean.wang@mediatek.com, linux-wireless@vger.kernel.org, linux-kernel@vger.kernel.org, Joshua Klinesmith , stable@vger.kernel.org Subject: [PATCH 1/3] wifi: mt76: mt7615: fix DMA read beyond mapped length Date: Mon, 6 Apr 2026 14:45:54 -0400 Message-ID: <20260406184556.8245-2-joshuaklinesmith@gmail.com> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20260406184556.8245-1-joshuaklinesmith@gmail.com> References: <20260406184556.8245-1-joshuaklinesmith@gmail.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit tx_prepare_skb() overrides buf[1].len to MT_CT_PARSE_LEN (72) for firmware header parsing, but dma_map_single() only maps skb_headlen(skb) bytes. When the SKB is shorter than 72 bytes, the hardware reads past the DMA-mapped region, causing SMMU translation faults on IOMMU-enabled systems. Cap the firmware parse length to the actual DMA-mapped length. Fixes: e90354e0452d ("mt76: mt7615: move core shared code in mt7615-common module") Cc: stable@vger.kernel.org Signed-off-by: Joshua Klinesmith --- drivers/net/wireless/mediatek/mt76/mt7615/pci_mac.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/net/wireless/mediatek/mt76/mt7615/pci_mac.c b/drivers/net/wireless/mediatek/mt76/mt7615/pci_mac.c index 53cb1eed1e4f..dc7128c46a72 100644 --- a/drivers/net/wireless/mediatek/mt76/mt7615/pci_mac.c +++ b/drivers/net/wireless/mediatek/mt76/mt7615/pci_mac.c @@ -35,7 +35,7 @@ mt7615_write_fw_txp(struct mt7615_dev *dev, struct mt76_tx_info *tx_info, /* pass partial skb header to fw */ tx_info->buf[0].len = MT_TXD_SIZE + sizeof(*txp); - tx_info->buf[1].len = MT_CT_PARSE_LEN; + tx_info->buf[1].len = min_t(u32, MT_CT_PARSE_LEN, tx_info->buf[1].len); tx_info->buf[1].skip_unmap = true; tx_info->nbuf = MT_CT_DMA_BUF_NUM; -- 2.43.0