linux-kernel - [PATCH] Input: refuse to register absolute devices without absinfo

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Message-ID: <20170131231515.GA37218@dtor-ws>
Date:   Tue, 31 Jan 2017 15:15:15 -0800
From:   Dmitry Torokhov <dmitry.torokhov@...il.com>
To:     linux-input@...r.kernel.org
Cc:     Benjamin Tissoires <benjamin.tissoires@...hat.com>,
        Jiri Kosina <jkosina@...e.cz>, linux-kernel@...r.kernel.org
Subject: [PATCH] Input: refuse to register absolute devices without absinfo

If device is supposed to send absolute events (i.e. EV_ABS bit is set in
dev->evbit) but dev->absinfo is not allocated, then the driver has done
something wrong, and we should not register such device. Otherwise we'll
crash later, when driver tries to send absolute event.

Signed-off-by: Dmitry Torokhov <dmitry.torokhov@...il.com>
---
 drivers/input/input.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/drivers/input/input.c b/drivers/input/input.c
index f0d2d45a68e3..4617f2db9e36 100644
--- a/drivers/input/input.c
+++ b/drivers/input/input.c
@@ -2095,6 +2095,12 @@ int input_register_device(struct input_dev *dev)
 	const char *path;
 	int error;
 
+	if (test_bit(EV_ABS, dev->evbit) && !dev->absinfo) {
+		dev_err(&dev->dev,
+			"Absolute device without dev->absinfo, refusing to register\n");
+		return -EINVAL;
+	}
+
 	if (dev->devres_managed) {
 		devres = devres_alloc(devm_input_device_unregister,
 				      sizeof(struct input_devres), GFP_KERNEL);
-- 
2.11.0.483.g087da7b7c-goog


-- 
Dmitry