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From: Sascha Hauer <s.hauer@pengutronix.de>
To: linux-spi@vger.kernel.org
Cc: Mark Brown <broonie@kernel.org>,
	Nicolas Ferre <nicolas.ferre@microchip.com>,
	Nicolas Saenz Julienne <nsaenzjulienne@suse.de>,
	Vladimir Oltean <olteanv@gmail.com>,
	Daniel Mack <daniel@zonque.org>,
	kernel@pengutronix.de, Sascha Hauer <s.hauer@pengutronix.de>
Subject: [PATCH 3/6] spi: bcm2835: Use devm_spi_register_controller()
Date: Tue, 22 Sep 2020 11:32:25 +0200	[thread overview]
Message-ID: <20200922093228.24917-4-s.hauer@pengutronix.de> (raw)
In-Reply-To: <20200922093228.24917-1-s.hauer@pengutronix.de>

Calling spi_unregister_controller() during driver remove results in
freeing the SPI controller and the associated driver data. Using it
later in bcm2835_spi_remove() is a use-after-free bug. Register the
controller with devm_spi_register_controller() instead which makes
calling spi_unregister_controller() unnecessary.

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
---
 drivers/spi/spi-bcm2835.c | 4 +---
 1 file changed, 1 insertion(+), 3 deletions(-)

diff --git a/drivers/spi/spi-bcm2835.c b/drivers/spi/spi-bcm2835.c
index c45d76c848c8..d22103f7beeb 100644
--- a/drivers/spi/spi-bcm2835.c
+++ b/drivers/spi/spi-bcm2835.c
@@ -1350,7 +1350,7 @@ static int bcm2835_spi_probe(struct platform_device *pdev)
 		goto out_dma_release;
 	}
 
-	err = spi_register_controller(ctlr);
+	err = devm_spi_register_controller(&pdev->dev, ctlr);
 	if (err) {
 		dev_err(&pdev->dev, "could not register SPI controller: %d\n",
 			err);
@@ -1377,8 +1377,6 @@ static int bcm2835_spi_remove(struct platform_device *pdev)
 
 	bcm2835_debugfs_remove(bs);
 
-	spi_unregister_controller(ctlr);
-
 	bcm2835_dma_release(ctlr, bs);
 
 	/* Clear FIFOs, and disable the HW block */
-- 
2.28.0


  parent reply	other threads:[~2020-09-22  9:32 UTC|newest]

Thread overview: 12+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-09-22  9:32 [PATCH 0/6] Fix use-after-free in SPI drivers Sascha Hauer
2020-09-22  9:32 ` [PATCH 1/6] spi: fsl-dspi: Use devm_spi_register_controller() Sascha Hauer
2020-09-22  9:44   ` Mark Brown
2020-09-22 11:06     ` Sascha Hauer
2020-09-22 11:25       ` Mark Brown
2020-09-22  9:32 ` [PATCH 2/6] spi: atmel-quadspi: " Sascha Hauer
2020-09-22  9:32 ` Sascha Hauer [this message]
2020-09-22  9:39   ` [PATCH 3/6] spi: bcm2835: " Nicolas Saenz Julienne
2020-09-22  9:32 ` [PATCH 4/6] spi: dw: " Sascha Hauer
2020-09-22  9:32 ` [PATCH 5/6] spi: pxa2xx: " Sascha Hauer
2020-09-22  9:32 ` [PATCH 6/6] spi: rpc-if: " Sascha Hauer
2020-10-15  5:44 ` [PATCH 0/6] Fix use-after-free in SPI drivers Lukas Wunner

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