linux-kernel - [PATCH 4.9 39/48] spi: mediatek: Avoid NULL pointer crash in interrupt

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Message-Id: <20220207103753.607222671@linuxfoundation.org>
Date:   Mon,  7 Feb 2022 12:06:12 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org,
        Benjamin Gaignard <benjamin.gaignard@...labora.com>,
        Mark Brown <broonie@...nel.org>
Subject: [PATCH 4.9 39/48] spi: mediatek: Avoid NULL pointer crash in interrupt

From: Benjamin Gaignard <benjamin.gaignard@...labora.com>

commit f83a96e5f033fbbd21764705cb9c04234b96218e upstream.

In some case, like after a transfer timeout, master->cur_msg pointer
is NULL which led to a kernel crash when trying to use master->cur_msg->spi.
mtk_spi_can_dma(), pointed by master->can_dma, doesn't use this parameter
avoid the problem by setting NULL as second parameter.

Fixes: a568231f46322 ("spi: mediatek: Add spi bus for Mediatek MT8173")
Signed-off-by: Benjamin Gaignard <benjamin.gaignard@...labora.com>
Link: https://lore.kernel.org/r/20220131141708.888710-1-benjamin.gaignard@collabora.com
Signed-off-by: Mark Brown <broonie@...nel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 drivers/spi/spi-mt65xx.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/drivers/spi/spi-mt65xx.c
+++ b/drivers/spi/spi-mt65xx.c
@@ -440,7 +440,7 @@ static irqreturn_t mtk_spi_interrupt(int
 	else
 		mdata->state = MTK_SPI_IDLE;
 
-	if (!master->can_dma(master, master->cur_msg->spi, trans)) {
+	if (!master->can_dma(master, NULL, trans)) {
 		if (trans->rx_buf) {
 			cnt = mdata->xfer_len / 4;
 			ioread32_rep(mdata->base + SPI_RX_DATA_REG,