linux-kernel - [PATCH 1/2] Input: atmel_mxt_ts - Fix double free of input device

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Message-Id: <1407420438-6289-2-git-send-email-nick.dyer@itdev.co.uk>
Date:	Thu,  7 Aug 2014 15:07:17 +0100
From:	nick.dyer@...ev.co.uk
To:	Dmitry Torokhov <dmitry.torokhov@...il.com>
Cc:	Yufeng Shen <miletus@...gle.com>,
	Daniel Kurtz <djkurtz@...omium.org>,
	Henrik Rydberg <rydberg@...omail.se>,
	Joonyoung Shim <jy0922.shim@...sung.com>,
	Alan Bowens <Alan.Bowens@...el.com>,
	linux-input@...r.kernel.org, linux-kernel@...r.kernel.org,
	Peter Meerwald <pmeerw@...erw.net>,
	Benson Leung <bleung@...omium.org>,
	Olof Johansson <olofj@...omium.org>,
	Sekhar Nori <nsekhar@...com>,
	Stephen Warren <swarren@...dotorg.org>,
	Nick Dyer <nick.dyer@...ev.co.uk>
Subject: [PATCH 1/2] Input: atmel_mxt_ts - Fix double free of input device

From: Stephen Warren <swarren@...dotorg.org>

Signed-off-by: Nick Dyer <nick.dyer@...ev.co.uk>
---
 drivers/input/touchscreen/atmel_mxt_ts.c | 7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)

diff --git a/drivers/input/touchscreen/atmel_mxt_ts.c b/drivers/input/touchscreen/atmel_mxt_ts.c
index 03b8571..da497db 100644
--- a/drivers/input/touchscreen/atmel_mxt_ts.c
+++ b/drivers/input/touchscreen/atmel_mxt_ts.c
@@ -1353,8 +1353,10 @@ static int mxt_get_info(struct mxt_data *data)
 
 static void mxt_free_object_table(struct mxt_data *data)
 {
-	input_unregister_device(data->input_dev);
-	data->input_dev = NULL;
+	if (data->input_dev) {
+		input_unregister_device(data->input_dev);
+		data->input_dev = NULL;
+	}
 
 	kfree(data->object_table);
 	data->object_table = NULL;
@@ -2194,7 +2196,6 @@ static int mxt_remove(struct i2c_client *client)
 
 	sysfs_remove_group(&client->dev.kobj, &mxt_attr_group);
 	free_irq(data->irq, data);
-	input_unregister_device(data->input_dev);
 	mxt_free_object_table(data);
 	kfree(data);
 
-- 
1.9.1

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