This is a note to let you know that I've just added the patch titled
Input: synaptics-rmi4 - fix use after free in rmi_unregister_function()
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-use-after-free-in-rmi_unreg.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 3e79df4a633309b4f9e37ce966e762b80c39a752
Author: Dan Carpenter <dan.carpenter@xxxxxxxxxx>
Date: Sun Oct 29 02:53:36 2023 +0000
Input: synaptics-rmi4 - fix use after free in rmi_unregister_function()
[ Upstream commit eb988e46da2e4eae89f5337e047ce372fe33d5b1 ]
The put_device() calls rmi_release_function() which frees "fn" so the
dereference on the next line "fn->num_of_irqs" is a use after free.
Move the put_device() to the end to fix this.
Fixes: 24d28e4f1271 ("Input: synaptics-rmi4 - convert irq distribution to irq_domain")
Signed-off-by: Dan Carpenter <dan.carpenter@xxxxxxxxxx>
Link: https://lore.kernel.org/r/706efd36-7561-42f3-adfa-dd1d0bd4f5a1@moroto.mountain
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@xxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
diff --git a/drivers/input/rmi4/rmi_bus.c b/drivers/input/rmi4/rmi_bus.c
index bd0d5ff01b08f..02408487b4423 100644
--- a/drivers/input/rmi4/rmi_bus.c
+++ b/drivers/input/rmi4/rmi_bus.c
@@ -279,11 +279,11 @@ void rmi_unregister_function(struct rmi_function *fn)
device_del(&fn->dev);
of_node_put(fn->dev.of_node);
- put_device(&fn->dev);
for (i = 0; i < fn->num_of_irqs; i++)
irq_dispose_mapping(fn->irq[i]);
+ put_device(&fn->dev);
}
/**
