[PATCH 6.19 191/342] spi: spi-fsl-lpspi: fix teardown order issue (UAF)

Greg Kroah-Hartman
2026-03-31T16:39:34Z

From: Marc Kleine-Budde <mkl@pengutronix.de>

[ Upstream commit b341c1176f2e001b3adf0b47154fc31589f7410e ]

There is a teardown order issue in the driver. The SPI controller is
registered using devm_spi_register_controller(), which delays
unregistration of the SPI controller until after the fsl_lpspi_remove()
function returns.

As the fsl_lpspi_remove() function synchronously tears down the DMA
channels, a running SPI transfer triggers the following NULL pointer
dereference due to use after free:

| fsl_lpspi 42550000.spi: I/O Error in DMA RX
| Unable to handle kernel NULL pointer dereference at virtual address 0000000000000000
[...]
| Call trace:
| fsl_lpspi_dma_transfer+0x260/0x340 [spi_fsl_lpspi]
| fsl_lpspi_transfer_one+0x198/0x448 [spi_fsl_lpspi]
| spi_transfer_one_message+0x49c/0x7c8
| __spi_pump_transfer_message+0x120/0x420
| __spi_sync+0x2c4/0x520
| spi_sync+0x34/0x60
| spidev_message+0x20c/0x378 [spidev]
| spidev_ioctl+0x398/0x750 [spidev]
[...]

Switch from devm_spi_register_controller() to spi_register_controller() in
fsl_lpspi_probe() and add the corresponding spi_unregister_controller() in
fsl_lpspi_remove().

Fixes: 5314987de5e5 ("spi: imx: add lpspi bus driver")
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>
Link: https://patch.msgid.link/20260319-spi-fsl-lpspi-fixes-v1-1-b433e435b2d8@pengutronix.de
Signed-off-by: Mark Brown <broonie@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
drivers/spi/spi-fsl-lpspi.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/spi/spi-fsl-lpspi.c b/drivers/spi/spi-fsl-lpspi.c
index 065456aba2aea..47d372557e4f6 100644
--- a/drivers/spi/spi-fsl-lpspi.c
+++ b/drivers/spi/spi-fsl-lpspi.c
@@ -972,7 +972,7 @@ static int fsl_lpspi_probe(struct platform_device *pdev)
enable_irq(irq);
}

- ret = devm_spi_register_controller(&pdev->dev, controller);
+ ret = spi_register_controller(controller);
if (ret < 0) {
dev_err_probe(&pdev->dev, ret, "spi_register_controller error\n");
goto free_dma;
@@ -998,6 +998,7 @@ static void fsl_lpspi_remove(struct platform_device *pdev)
struct fsl_lpspi_data *fsl_lpspi =
spi_controller_get_devdata(controller);

+ spi_unregister_controller(controller);
fsl_lpspi_dma_exit(controller);

pm_runtime_dont_use_autosuspend(fsl_lpspi->dev);
--
2.53.0