spi: spi-geni-qcom: Fix use-after-free on unbind

commit 8f96c434dfbc85ffa755d6634c8c1cb2233fcf24 upstream.

spi_geni_remove() accesses the driver's private data after calling
spi_unregister_master() even though that function releases the last
reference on the spi_master and thereby frees the private data.

Moreover, since commit 1a9e489e6128 ("spi: spi-geni-qcom: Use OPP API to
set clk/perf state"), spi_geni_probe() leaks the spi_master allocation
if the calls to dev_pm_opp_set_clkname() or dev_pm_opp_of_add_table()
fail.

Fix by switching over to the new devm_spi_alloc_master() helper which
keeps the private data accessible until the driver has unbound and also
avoids the spi_master leak on probe.

Fixes: 561de45f72bd ("spi: spi-geni-qcom: Add SPI driver support for GENI based QUP")
Signed-off-by: Lukas Wunner <lukas@wunner.de>
Cc: <stable@vger.kernel.org> # v4.20+: 5e844cc37a5c: spi: Introduce device-managed SPI controller allocation
Cc: <stable@vger.kernel.org> # v4.20+
Cc: Rajendra Nayak <rnayak@codeaurora.org>
Cc: Girish Mahadevan <girishm@codeaurora.org>
Link: https://lore.kernel.org/r/dfa1d8c41b8acdfad87ec8654cd124e6e3cb3f31.1607286887.git.lukas@wunner.de
Signed-off-by: Mark Brown <broonie@kernel.org>
[lukas: backport to v5.4.123]
Signed-off-by: Lukas Wunner <lukas@wunner.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/spi/spi-geni-qcom.c b/drivers/spi/spi-geni-qcom.c
index 6f3d64a1a2b3e2261d1dffeb17bd96babe4334b8..01b53d816497c03460894835af37d9d3354cf8e8 100644 (file)
--- a/drivers/spi/spi-geni-qcom.c
+++ b/drivers/spi/spi-geni-qcom.c
@@ -552,7 +552,7 @@ static int spi_geni_probe(struct platform_device *pdev)
                return PTR_ERR(clk);
        }
 
-       spi = spi_alloc_master(&pdev->dev, sizeof(*mas));
+       spi = devm_spi_alloc_master(&pdev->dev, sizeof(*mas));
        if (!spi)
                return -ENOMEM;
 
@@ -599,7 +599,6 @@ spi_geni_probe_free_irq:
        free_irq(mas->irq, spi);
 spi_geni_probe_runtime_disable:
        pm_runtime_disable(&pdev->dev);
-       spi_master_put(spi);
        return ret;
 }