This is a note to let you know that I've just added the patch titled
Input: synaptics-rmi4 - fix UAF of IRQ domain on driver removal
to the 4.19-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:
input-synaptics-rmi4-fix-uaf-of-irq-domain-on-driver.patch
and it can be found in the queue-4.19 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit bbd17b81b15bf99e8743d564fb5430616349c2f2
Author: Mathias Krause <minipli@xxxxxxxxxxxxxx>
Date: Thu Feb 22 15:26:54 2024 +0100
Input: synaptics-rmi4 - fix UAF of IRQ domain on driver removal
[ Upstream commit fbf8d71742557abaf558d8efb96742d442720cc2 ]
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@xxxxxxxxxxx>
Signed-off-by: Mathias Krause <minipli@xxxxxxxxxxxxxx>
Link: https://lore.kernel.org/r/20240222142654.856566-1-minipli@xxxxxxxxxxxxxx
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@xxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
diff --git a/drivers/input/rmi4/rmi_driver.c b/drivers/input/rmi4/rmi_driver.c
index ac6a20f7afdfa..480c4c3ccee24 100644
--- a/drivers/input/rmi4/rmi_driver.c
+++ b/drivers/input/rmi4/rmi_driver.c
@@ -981,12 +981,12 @@ 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;
}
