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iio: adc: xilinx: fix potential use-after-free on probe

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[ Upstream commit 862e4644fd ]

If probe errors out after request_irq(), its error path
does not explicitly cancel the delayed work, which may
have been scheduled by the interrupt handler.

This means the delayed work may still be running when
the core frees the private structure (struct xadc).
This is a potential use-after-free.

Fix by inserting cancel_delayed_work_sync() in the probe
error path.

Signed-off-by: Sven Van Asbroeck <TheSven73@gmail.com>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Sven Van Asbroeck 2019-03-10 14:58:25 -04:00 committed by Greg Kroah-Hartman
parent 06d5ea398e
commit 6400212ae3
1 changed files with 1 additions and 0 deletions
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1
drivers/iio/adc/xilinx-xadc-core.c
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@ -1290,6 +1290,7 @@ static int xadc_probe(struct platform_device *pdev)
err_free_irq:
free_irq(xadc->irq, indio_dev);
cancel_delayed_work_sync(&xadc->zynq_unmask_work);
err_clk_disable_unprepare:
clk_disable_unprepare(xadc->clk);
err_free_samplerate_trigger: