linux-kernel - [PATCH 04/26] Input: synaptics-rmi4 - prevent oopses when irq arrives while the device is not bound

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Date:	Thu, 5 Nov 2015 15:37:25 -0800
From:	Andrew Duggan <aduggan@...aptics.com>
To:	<linux-input@...r.kernel.org>, <linux-kernel@...r.kernel.org>
CC:	Benjamin Tissoires <benjamin.tissoires@...hat.com>,
	Dmitry Torokhov <dmitry.torokhov@...il.com>,
	Linus Walleij <linus.walleij@...aro.org>,
	Benjamin Tissoires <benjamin.tissoires@...il.com>,
	Christopher Heiny <cheiny@...aptics.com>,
	Stephen Chandler Paul <cpaul@...hat.com>
Subject: [PATCH 04/26] Input: synaptics-rmi4 - prevent oopses when irq arrives while the device is not bound

From: Benjamin Tissoires <benjamin.tissoires@...hat.com>

If the device has been registered but is not populated, we should not
process any incoming interrupt.
Make sure the pointers we are following are valid.

Signed-off-by: Benjamin Tissoires <benjamin.tissoires@...hat.com>
Tested-by: Andrew Duggan <aduggan@...aptics.com>
---
 drivers/input/rmi4/rmi_driver.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/input/rmi4/rmi_driver.c b/drivers/input/rmi4/rmi_driver.c
index 2fdc7e8..fe5f2f9 100644
--- a/drivers/input/rmi4/rmi_driver.c
+++ b/drivers/input/rmi4/rmi_driver.c
@@ -279,6 +279,9 @@ int rmi_process_interrupt_requests(struct rmi_device *rmi_dev)
 	struct rmi_function *entry;
 	int error;
 
+	if (!data || !data->f01_container || !data->irq_status)
+		return 0;
+
 	error = rmi_read_block(rmi_dev,
 				data->f01_container->fd.data_base_addr + 1,
 				data->irq_status, data->num_of_irq_regs);
-- 
2.1.4

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