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Input: synaptics-rmi4 - fix UAF of IRQ domain on driver removal

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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: 24d28e4f12 ("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>
This commit is contained in:
Mathias Krause 2024-02-22 15:26:54 +01:00 committed by Dmitry Torokhov
parent 963465a331
commit fbf8d71742
1 changed files with 3 additions and 3 deletions
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6
drivers/input/rmi4/rmi_driver.c
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@ -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;
}