[PATCH v4 1/3] Input: applespi - cancel pending work on driver remove

[Shih-Yuan Lee <fourdollars@debian.org>]

During driver removal in applespi_remove(), the managed private data
structure is freed by devres. However, the driver does not cancel the
asynchronous work applespi->work, which registers the touchpad input
device.

This creates a use-after-free (UAF) vulnerability if a pending or
running worker thread attempts to access the private data after the
remove function returns.

Fix this by explicitly calling cancel_work_sync(&applespi->work) in
applespi_remove() before cleanups.

Signed-off-by: Shih-Yuan Lee <fourdollars@debian.org>
---
 drivers/input/keyboard/applespi.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/input/keyboard/applespi.c b/drivers/input/keyboard/applespi.c
index b5ff71cd5a70..3bdb9e7cfb8b 100644
--- a/drivers/input/keyboard/applespi.c
+++ b/drivers/input/keyboard/applespi.c
@@ -1822,6 +1822,8 @@ static void applespi_remove(struct spi_device *spi)
 
 	applespi_drain_reads(applespi);
 
+	cancel_work_sync(&applespi->work);
+
 	debugfs_remove_recursive(applespi->debugfs_root);
 }
 
-- 
2.39.5