From: Mathias Krause minipli@grsecurity.net

commit fbf8d71742557abaf558d8efb96742d442720cc2 upstream.

Calling irq_domain_remove() will lead to freeing the IRQ domain prematurely. The domain is still referenced and will be attempted to get used via rmi_free_function_list() -> rmi_unregister_function() -> irq_dispose_mapping() -> irq_get_irq_data()'s ->domain pointer.

With PaX's MEMORY_SANITIZE this will lead to an access fault when attempting to dereference embedded pointers, as in Torsten's report that was faulting on the 'domain->ops->unmap' test.

Fix this by releasing the IRQ domain only after all related IRQs have been deactivated.

Fixes: 24d28e4f1271 ("Input: synaptics-rmi4 - convert irq distribution to irq_domain") Reported-by: Torsten Hilbrich torsten.hilbrich@secunet.com Signed-off-by: Mathias Krause minipli@grsecurity.net Link: https://lore.kernel.org/r/20240222142654.856566-1-minipli@grsecurity.net Signed-off-by: Dmitry Torokhov dmitry.torokhov@gmail.com Signed-off-by: Tzung-Bi Shih tzungbi@kernel.org ---

Commit 24d28e4f1271 ("Input: synaptics-rmi4 - convert irq distribution to irq_domain") was first seen in v4.18-rc3. While the fix fbf8d7174255 ("Input: synaptics-rmi4 - fix UAF of IRQ domain on driver removal") was first seen in v6.8.

In the field test, we observed the UAF which was triggered via re-probing hid_rmi driver.

linux-6.6.y, linux-6.1.y, linux-5.15.y, linux-5.10.y, linux-5.4.y, and linux-4.19.y haven't backported commit fbf8d7174255. Let's backport it.

---

drivers/input/rmi4/rmi_driver.c | 6 +++--- 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/drivers/input/rmi4/rmi_driver.c b/drivers/input/rmi4/rmi_driver.c index aa32371f04af..ef9ea295f9e0 100644 --- a/drivers/input/rmi4/rmi_driver.c +++ b/drivers/input/rmi4/rmi_driver.c @@ -978,12 +978,12 @@ static int rmi_driver_remove(struct device *dev)

rmi_disable_irq(rmi_dev, false);

- irq_domain_remove(data->irqdomain); - data->irqdomain = NULL; - rmi_f34_remove_sysfs(rmi_dev); rmi_free_function_list(rmi_dev);

+ irq_domain_remove(data->irqdomain); + data->irqdomain = NULL; + return 0; }