This is a note to let you know that I've just added the patch titled
spi: spi-axi: fix potential use-after-free after deregistration
to the 4.14-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
spi-spi-axi-fix-potential-use-after-free-after-deregistration.patch
and it can be found in the queue-4.14 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From foo@baz Wed Dec 6 18:04:41 CET 2017
From: Johan Hovold <johan@xxxxxxxxxx>
Date: Mon, 30 Oct 2017 11:35:27 +0100
Subject: spi: spi-axi: fix potential use-after-free after deregistration
From: Johan Hovold <johan@xxxxxxxxxx>
[ Upstream commit 4d5e0689dc9d5640ad46cdfbe1896b74d8df1661 ]
Take an extra reference to the controller before deregistering it to
prevent use-after-free in the interrupt handler in case an interrupt
fires before the line is disabled.
Fixes: b1353d1c1d45 ("spi: Add Analog Devices AXI SPI Engine controller support")
Acked-by: Lars-Peter Clausen <lars@xxxxxxxxxx>
Signed-off-by: Johan Hovold <johan@xxxxxxxxxx>
Signed-off-by: Mark Brown <broonie@xxxxxxxxxx>
Signed-off-by: Sasha Levin <alexander.levin@xxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/spi/spi-axi-spi-engine.c | 4 +++-
1 file changed, 3 insertions(+), 1 deletion(-)
--- a/drivers/spi/spi-axi-spi-engine.c
+++ b/drivers/spi/spi-axi-spi-engine.c
@@ -553,7 +553,7 @@ err_put_master:
static int spi_engine_remove(struct platform_device *pdev)
{
- struct spi_master *master = platform_get_drvdata(pdev);
+ struct spi_master *master = spi_master_get(platform_get_drvdata(pdev));
struct spi_engine *spi_engine = spi_master_get_devdata(master);
int irq = platform_get_irq(pdev, 0);
@@ -561,6 +561,8 @@ static int spi_engine_remove(struct plat
free_irq(irq, master);
+ spi_master_put(master);
+
writel_relaxed(0xff, spi_engine->base + SPI_ENGINE_REG_INT_PENDING);
writel_relaxed(0x00, spi_engine->base + SPI_ENGINE_REG_INT_ENABLE);
writel_relaxed(0x01, spi_engine->base + SPI_ENGINE_REG_RESET);
Patches currently in stable-queue which might be from johan@xxxxxxxxxx are
queue-4.14/staging-greybus-loopback-fix-iteration-count-on-async-path.patch
queue-4.14/usb-serial-usb_debug-add-new-usb-device-id.patch
queue-4.14/spi-spi-axi-fix-potential-use-after-free-after-deregistration.patch
queue-4.14/usb-serial-option-add-quectel-bg96-id.patch