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| author | Lukas Wunner <lukas@wunner.de> | 2020-12-07 09:17:05 +0100 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2021-01-17 13:55:13 +0100 |
| commit | 5d474e3f5edbbb79470d35f77669c7da5ea16a42 (patch) | |
| tree | f306f2177b3203a5313d5122fefc8f4bc9e738e5 | |
| parent | b0260231660261a9b7b2eaaea5188baba163f81f (diff) | |
| download | linux-stable-5d474e3f5edbbb79470d35f77669c7da5ea16a42.tar.gz linux-stable-5d474e3f5edbbb79470d35f77669c7da5ea16a42.tar.bz2 linux-stable-5d474e3f5edbbb79470d35f77669c7da5ea16a42.zip | |
spi: pxa2xx: Fix use-after-free on unbind
commit 5626308bb94d9f930aa5f7c77327df4c6daa7759 upstream
pxa2xx_spi_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/slave() helper
which keeps the private data accessible until the driver has unbound.
Fixes: 32e5b57232c0 ("spi: pxa2xx: Fix controller unregister order")
Signed-off-by: Lukas Wunner <lukas@wunner.de>
Cc: <stable@vger.kernel.org> # v2.6.17+: 5e844cc37a5c: spi: Introduce device-managed SPI controller allocation
Cc: <stable@vger.kernel.org> # v2.6.17+: 32e5b57232c0: spi: pxa2xx: Fix controller unregister order
Cc: <stable@vger.kernel.org> # v2.6.17+
Link: https://lore.kernel.org/r/5764b04d4a6e43069ebb7808f64c2f774ac6f193.1607286887.git.lukas@wunner.de
Signed-off-by: Mark Brown <broonie@kernel.org>
[sudip: adjust context]
Signed-off-by: Sudip Mukherjee <sudipm.mukherjee@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
| -rw-r--r-- | drivers/spi/spi-pxa2xx.c | 3 |
1 files changed, 1 insertions, 2 deletions
diff --git a/drivers/spi/spi-pxa2xx.c b/drivers/spi/spi-pxa2xx.c index cfcc5a9a5cc9..d696cdd961a9 100644 --- a/drivers/spi/spi-pxa2xx.c +++ b/drivers/spi/spi-pxa2xx.c @@ -1479,7 +1479,7 @@ static int pxa2xx_spi_probe(struct platform_device *pdev) return -ENODEV; } - master = spi_alloc_master(dev, sizeof(struct driver_data)); + master = devm_spi_alloc_master(dev, sizeof(*drv_data)); if (!master) { dev_err(&pdev->dev, "cannot alloc spi_master\n"); pxa_ssp_free(ssp); @@ -1619,7 +1619,6 @@ out_error_clock_enabled: free_irq(ssp->irq, drv_data); out_error_master_alloc: - spi_master_put(master); pxa_ssp_free(ssp); return status; } |