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spi: bcm-qspi: Fix use-after-free on unbind

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[ Upstream commit 63c5395bb7 ]

bcm_qspi_remove() calls spi_unregister_master() even though
bcm_qspi_probe() calls devm_spi_register_master().  The spi_master is
therefore unregistered and freed twice on unbind.

Fix by switching over to the new devm_spi_alloc_master() helper which
keeps the private data accessible until the driver has unbound.

While at it, fix an ordering issue in bcm_qspi_remove() wherein
spi_unregister_master() is called after uninitializing the hardware,
disabling the clock and freeing an IRQ data structure.  The correct
order is to call spi_unregister_master() *before* those teardown steps
because bus accesses may still be ongoing until that function returns.

Fixes: fa236a7ef2 ("spi: bcm-qspi: Add Broadcom MSPI driver")
Signed-off-by: Lukas Wunner <lukas@wunner.de>
Cc: <stable@vger.kernel.org> # v4.9+: 5e844cc37a: spi: Introduce device-managed SPI controller allocation
Cc: <stable@vger.kernel.org> # v4.9+
Cc: Kamal Dasu <kdasu.kdev@gmail.com>
Acked-by: Florian Fainelli <f.fainelli@gmail.com>
Tested-by: Florian Fainelli <f.fainelli@gmail.com>
Link: https://lore.kernel.org/r/5e31a9a59fd1c0d0b795b2fe219f25e5ee855f9d.1605121038.git.lukas@wunner.de
Signed-off-by: Mark Brown <broonie@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Lukas Wunner
2020-12-06 13:46:01 +01:00
committed by Chris
parent 960c18a31b
commit b0e2e7cd6c
1 changed files with 12 additions and 22 deletions
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34
drivers/spi/spi-bcm-qspi.c
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@@ -1185,7 +1185,7 @@ int bcm_qspi_probe(struct platform_device *pdev,
if (!of_match_node(bcm_qspi_of_match, dev->of_node))
return -ENODEV;
master = spi_alloc_master(dev, sizeof(struct bcm_qspi));
master = devm_spi_alloc_master(dev, sizeof(struct bcm_qspi));
if (!master) {
dev_err(dev, "error allocating spi_master\n");
return -ENOMEM;
@@ -1218,21 +1218,17 @@ int bcm_qspi_probe(struct platform_device *pdev,
if (res) {
qspi->base[MSPI] = devm_ioremap_resource(dev, res);
if (IS_ERR(qspi->base[MSPI])) {
ret = PTR_ERR(qspi->base[MSPI]);
goto qspi_resource_err;
}
if (IS_ERR(qspi->base[MSPI]))
return PTR_ERR(qspi->base[MSPI]);
} else {
goto qspi_resource_err;
return 0;
}
res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "bspi");
if (res) {
qspi->base[BSPI] = devm_ioremap_resource(dev, res);
if (IS_ERR(qspi->base[BSPI])) {
ret = PTR_ERR(qspi->base[BSPI]);
goto qspi_resource_err;
}
if (IS_ERR(qspi->base[BSPI]))
return PTR_ERR(qspi->base[BSPI]);
qspi->bspi_mode = true;
} else {
qspi->bspi_mode = false;
@@ -1243,18 +1239,14 @@ int bcm_qspi_probe(struct platform_device *pdev,
res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "cs_reg");
if (res) {
qspi->base[CHIP_SELECT] = devm_ioremap_resource(dev, res);
if (IS_ERR(qspi->base[CHIP_SELECT])) {
ret = PTR_ERR(qspi->base[CHIP_SELECT]);
goto qspi_resource_err;
}
if (IS_ERR(qspi->base[CHIP_SELECT]))
return PTR_ERR(qspi->base[CHIP_SELECT]);
}
qspi->dev_ids = kcalloc(num_irqs, sizeof(struct bcm_qspi_dev_id),
GFP_KERNEL);
if (!qspi->dev_ids) {
ret = -ENOMEM;
goto qspi_resource_err;
}
if (!qspi->dev_ids)
return -ENOMEM;
for (val = 0; val < num_irqs; val++) {
irq = -1;
@@ -1330,7 +1322,7 @@ int bcm_qspi_probe(struct platform_device *pdev,
qspi->xfer_mode.addrlen = -1;
qspi->xfer_mode.hp = -1;
ret = devm_spi_register_master(&pdev->dev, master);
ret = spi_register_master(master);
if (ret < 0) {
dev_err(dev, "can't register master\n");
goto qspi_reg_err;
@@ -1343,8 +1335,6 @@ qspi_reg_err:
clk_disable_unprepare(qspi->clk);
qspi_probe_err:
kfree(qspi->dev_ids);
qspi_resource_err:
spi_master_put(master);
return ret;
}
/* probe function to be called by SoC specific platform driver probe */
@@ -1355,10 +1345,10 @@ int bcm_qspi_remove(struct platform_device *pdev)
struct bcm_qspi *qspi = platform_get_drvdata(pdev);
platform_set_drvdata(pdev, NULL);
spi_unregister_master(qspi->master);
bcm_qspi_hw_uninit(qspi);
clk_disable_unprepare(qspi->clk);
kfree(qspi->dev_ids);
spi_unregister_master(qspi->master);
return 0;
}