* [PATCH AUTOSEL 5.0 01/99] iio: adc: xilinx: fix potential use-after-free on remove
@ 2019-05-07 5:30 Sasha Levin
2019-05-07 5:30 ` [PATCH AUTOSEL 5.0 02/99] iio: adc: xilinx: fix potential use-after-free on probe Sasha Levin
2019-05-07 5:30 ` [PATCH AUTOSEL 5.0 03/99] iio: adc: xilinx: prevent touching unclocked h/w on remove Sasha Levin
0 siblings, 2 replies; 3+ messages in thread
From: Sasha Levin @ 2019-05-07 5:30 UTC (permalink / raw)
To: linux-kernel, stable
Cc: Sven Van Asbroeck, Sven Van Asbroeck, Jonathan Cameron,
Sasha Levin, linux-iio
From: Sven Van Asbroeck <thesven73@gmail.com>
[ Upstream commit 62039b6aef63380ba7a37c113bbaeee8a55c5342 ]
When cancel_delayed_work() returns, the delayed work may still
be running. This means that the core could potentially free
the private structure (struct xadc) while the delayed work
is still using it. This is a potential use-after-free.
Fix by calling cancel_delayed_work_sync(), which waits for
any residual work to finish before returning.
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>
---
drivers/iio/adc/xilinx-xadc-core.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/drivers/iio/adc/xilinx-xadc-core.c b/drivers/iio/adc/xilinx-xadc-core.c
index 3f6be5ac049a..1960694e8007 100644
--- a/drivers/iio/adc/xilinx-xadc-core.c
+++ b/drivers/iio/adc/xilinx-xadc-core.c
@@ -1320,7 +1320,7 @@ static int xadc_remove(struct platform_device *pdev)
}
free_irq(xadc->irq, indio_dev);
clk_disable_unprepare(xadc->clk);
- cancel_delayed_work(&xadc->zynq_unmask_work);
+ cancel_delayed_work_sync(&xadc->zynq_unmask_work);
kfree(xadc->data);
kfree(indio_dev->channels);
--
2.20.1
^ permalink raw reply related [flat|nested] 3+ messages in thread
* [PATCH AUTOSEL 5.0 02/99] iio: adc: xilinx: fix potential use-after-free on probe
2019-05-07 5:30 [PATCH AUTOSEL 5.0 01/99] iio: adc: xilinx: fix potential use-after-free on remove Sasha Levin
@ 2019-05-07 5:30 ` Sasha Levin
2019-05-07 5:30 ` [PATCH AUTOSEL 5.0 03/99] iio: adc: xilinx: prevent touching unclocked h/w on remove Sasha Levin
1 sibling, 0 replies; 3+ messages in thread
From: Sasha Levin @ 2019-05-07 5:30 UTC (permalink / raw)
To: linux-kernel, stable
Cc: Sven Van Asbroeck, Sven Van Asbroeck, Jonathan Cameron,
Sasha Levin, linux-iio
From: Sven Van Asbroeck <thesven73@gmail.com>
[ Upstream commit 862e4644fd2d7df8998edc65e0963ea2f567bde9 ]
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>
---
drivers/iio/adc/xilinx-xadc-core.c | 1 +
1 file changed, 1 insertion(+)
diff --git a/drivers/iio/adc/xilinx-xadc-core.c b/drivers/iio/adc/xilinx-xadc-core.c
index 1960694e8007..15e1a103f37d 100644
--- a/drivers/iio/adc/xilinx-xadc-core.c
+++ b/drivers/iio/adc/xilinx-xadc-core.c
@@ -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:
--
2.20.1
^ permalink raw reply related [flat|nested] 3+ messages in thread
* [PATCH AUTOSEL 5.0 03/99] iio: adc: xilinx: prevent touching unclocked h/w on remove
2019-05-07 5:30 [PATCH AUTOSEL 5.0 01/99] iio: adc: xilinx: fix potential use-after-free on remove Sasha Levin
2019-05-07 5:30 ` [PATCH AUTOSEL 5.0 02/99] iio: adc: xilinx: fix potential use-after-free on probe Sasha Levin
@ 2019-05-07 5:30 ` Sasha Levin
1 sibling, 0 replies; 3+ messages in thread
From: Sasha Levin @ 2019-05-07 5:30 UTC (permalink / raw)
To: linux-kernel, stable
Cc: Sven Van Asbroeck, Sven Van Asbroeck, Jonathan Cameron,
Sasha Levin, linux-iio
From: Sven Van Asbroeck <thesven73@gmail.com>
[ Upstream commit 2e4b88f73966adead360e47621df0183586fac32 ]
In remove, the clock is disabled before canceling the
delayed work. This means that the delayed work may be
touching unclocked hardware.
Fix by disabling the clock after the delayed work is
fully canceled. This is consistent with the probe error
path order.
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>
---
drivers/iio/adc/xilinx-xadc-core.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/drivers/iio/adc/xilinx-xadc-core.c b/drivers/iio/adc/xilinx-xadc-core.c
index 15e1a103f37d..1ae86e7359f7 100644
--- a/drivers/iio/adc/xilinx-xadc-core.c
+++ b/drivers/iio/adc/xilinx-xadc-core.c
@@ -1320,8 +1320,8 @@ static int xadc_remove(struct platform_device *pdev)
iio_triggered_buffer_cleanup(indio_dev);
}
free_irq(xadc->irq, indio_dev);
- clk_disable_unprepare(xadc->clk);
cancel_delayed_work_sync(&xadc->zynq_unmask_work);
+ clk_disable_unprepare(xadc->clk);
kfree(xadc->data);
kfree(indio_dev->channels);
--
2.20.1
^ permalink raw reply related [flat|nested] 3+ messages in thread
end of thread, other threads:[~2019-05-07 6:09 UTC | newest]
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2019-05-07 5:30 [PATCH AUTOSEL 5.0 01/99] iio: adc: xilinx: fix potential use-after-free on remove Sasha Levin
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2019-05-07 5:30 ` [PATCH AUTOSEL 5.0 03/99] iio: adc: xilinx: prevent touching unclocked h/w on remove Sasha Levin
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