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authorLukas Wunner2020-12-07 09:17:17 +0100
committerMark Brown2020-12-07 14:19:01 +0000
commitc7b884561cb5b641f3dbba950094110794119a6d (patch)
tree6b462cfe956dbceaa54f9769b55c21da25450300 /drivers/spi
parent234266a5168bbe8220d263e3aa7aa80cf921c483 (diff)
spi: atmel-quadspi: Fix use-after-free on unbind
atmel_qspi_remove() accesses the driver's private data after calling spi_unregister_controller() even though that function releases the last reference on the spi_controller and thereby frees the private data. Fix by switching over to the new devm_spi_alloc_master() helper which keeps the private data accessible until the driver has unbound. Fixes: 2d30ac5ed633 ("mtd: spi-nor: atmel-quadspi: Use spi-mem interface for atmel-quadspi driver") Signed-off-by: Lukas Wunner <lukas@wunner.de> Cc: <stable@vger.kernel.org> # v5.0+: 5e844cc37a5c: spi: Introduce device-managed SPI controller allocation Cc: <stable@vger.kernel.org> # v5.0+ Cc: Piotr Bugalski <bugalski.piotr@gmail.com> Link: https://lore.kernel.org/r/4b05c65cf6f1ea3251484fe9a00b4c65478a1ae3.1607286887.git.lukas@wunner.de Signed-off-by: Mark Brown <broonie@kernel.org>
Diffstat (limited to 'drivers/spi')
-rw-r--r--drivers/spi/atmel-quadspi.c15
1 files changed, 5 insertions, 10 deletions
diff --git a/drivers/spi/atmel-quadspi.c b/drivers/spi/atmel-quadspi.c
index b44521d4a245..1742ccc1ad0e 100644
--- a/drivers/spi/atmel-quadspi.c
+++ b/drivers/spi/atmel-quadspi.c
@@ -535,7 +535,7 @@ static int atmel_qspi_probe(struct platform_device *pdev)
struct resource *res;
int irq, err = 0;
- ctrl = spi_alloc_master(&pdev->dev, sizeof(*aq));
+ ctrl = devm_spi_alloc_master(&pdev->dev, sizeof(*aq));
if (!ctrl)
return -ENOMEM;
@@ -557,8 +557,7 @@ static int atmel_qspi_probe(struct platform_device *pdev)
aq->regs = devm_ioremap_resource(&pdev->dev, res);
if (IS_ERR(aq->regs)) {
dev_err(&pdev->dev, "missing registers\n");
- err = PTR_ERR(aq->regs);
- goto exit;
+ return PTR_ERR(aq->regs);
}
/* Map the AHB memory */
@@ -566,8 +565,7 @@ static int atmel_qspi_probe(struct platform_device *pdev)
aq->mem = devm_ioremap_resource(&pdev->dev, res);
if (IS_ERR(aq->mem)) {
dev_err(&pdev->dev, "missing AHB memory\n");
- err = PTR_ERR(aq->mem);
- goto exit;
+ return PTR_ERR(aq->mem);
}
aq->mmap_size = resource_size(res);
@@ -579,15 +577,14 @@ static int atmel_qspi_probe(struct platform_device *pdev)
if (IS_ERR(aq->pclk)) {
dev_err(&pdev->dev, "missing peripheral clock\n");
- err = PTR_ERR(aq->pclk);
- goto exit;
+ return PTR_ERR(aq->pclk);
}
/* Enable the peripheral clock */
err = clk_prepare_enable(aq->pclk);
if (err) {
dev_err(&pdev->dev, "failed to enable the peripheral clock\n");
- goto exit;
+ return err;
}
aq->caps = of_device_get_match_data(&pdev->dev);
@@ -638,8 +635,6 @@ disable_qspick:
clk_disable_unprepare(aq->qspick);
disable_pclk:
clk_disable_unprepare(aq->pclk);
-exit:
- spi_controller_put(ctrl);
return err;
}