linux-kernel - [PATCH 4.19 147/148] spi: spi-mt65xx: Fix NULL pointer access in interrupt handler

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Date: Sun, 24 Mar 2024 19:50:11 -0400
From: Sasha Levin <sashal@...nel.org>
To: linux-kernel@...r.kernel.org,
	stable@...r.kernel.org
Cc: Fei Shao <fshao@...omium.org>,
	AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com>,
	Mark Brown <broonie@...nel.org>,
	Sasha Levin <sashal@...nel.org>
Subject: [PATCH 4.19 147/148] spi: spi-mt65xx: Fix NULL pointer access in interrupt handler

From: Fei Shao <fshao@...omium.org>

[ Upstream commit a20ad45008a7c82f1184dc6dee280096009ece55 ]

The TX buffer in spi_transfer can be a NULL pointer, so the interrupt
handler may end up writing to the invalid memory and cause crashes.

Add a check to trans->tx_buf before using it.

Fixes: 1ce24864bff4 ("spi: mediatek: Only do dma for 4-byte aligned buffers")
Signed-off-by: Fei Shao <fshao@...omium.org>
Reviewed-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com>
Link: https://msgid.link/r/20240321070942.1587146-2-fshao@chromium.org
Signed-off-by: Mark Brown <broonie@...nel.org>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/spi/spi-mt65xx.c | 22 ++++++++++++----------
 1 file changed, 12 insertions(+), 10 deletions(-)

diff --git a/drivers/spi/spi-mt65xx.c b/drivers/spi/spi-mt65xx.c
index faca2ab758992..89ec119215371 100644
--- a/drivers/spi/spi-mt65xx.c
+++ b/drivers/spi/spi-mt65xx.c
@@ -524,17 +524,19 @@ static irqreturn_t mtk_spi_interrupt(int irq, void *dev_id)
 		mdata->xfer_len = min(MTK_SPI_MAX_FIFO_SIZE, len);
 		mtk_spi_setup_packet(master);
 
-		cnt = mdata->xfer_len / 4;
-		iowrite32_rep(mdata->base + SPI_TX_DATA_REG,
-				trans->tx_buf + mdata->num_xfered, cnt);
+		if (trans->tx_buf) {
+			cnt = mdata->xfer_len / 4;
+			iowrite32_rep(mdata->base + SPI_TX_DATA_REG,
+					trans->tx_buf + mdata->num_xfered, cnt);
 
-		remainder = mdata->xfer_len % 4;
-		if (remainder > 0) {
-			reg_val = 0;
-			memcpy(&reg_val,
-				trans->tx_buf + (cnt * 4) + mdata->num_xfered,
-				remainder);
-			writel(reg_val, mdata->base + SPI_TX_DATA_REG);
+			remainder = mdata->xfer_len % 4;
+			if (remainder > 0) {
+				reg_val = 0;
+				memcpy(&reg_val,
+					trans->tx_buf + (cnt * 4) + mdata->num_xfered,
+					remainder);
+				writel(reg_val, mdata->base + SPI_TX_DATA_REG);
+			}
 		}
 
 		mtk_spi_enable_transfer(master);
-- 
2.43.0