From: Dan Carpenter dan.carpenter@linaro.org

stable inclusion from stable-v4.19.299 commit 2f236d8638f5b43e0c72919a6a27fe286c32053f category: bugfix bugzilla: https://gitee.com/openeuler/kernel/issues/I9RDP6 CVE: CVE-2023-52840

Reference: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=...

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[ 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@linaro.org Link: https://lore.kernel.org/r/706efd36-7561-42f3-adfa-dd1d0bd4f5a1@moroto.mounta... Signed-off-by: Dmitry Torokhov dmitry.torokhov@gmail.com Signed-off-by: Sasha Levin sashal@kernel.org Signed-off-by: Liu Chuang liuchuang40@huawei.com --- drivers/input/rmi4/rmi_bus.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/input/rmi4/rmi_bus.c b/drivers/input/rmi4/rmi_bus.c index bd0d5ff01b08..02408487b442 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); }

/**