linux-kernel - [PATCH 1/2] i2c-dev: don't get i2c adapter via i2c

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Date:	Tue,  5 Jul 2016 19:57:06 -0700
From:	Viresh Kumar <viresh.kumar@...aro.org>
To:	Wolfram Sang <wsa@...-dreams.de>, Jean Delvare <jdelvare@...e.com>
Cc:	linux-i2c@...r.kernel.org, linux-kernel@...r.kernel.org,
	gregkh@...uxfoundation.org, Johan Hovold <johan@...nel.org>,
	Alex Elder <elder@...aro.org>,
	Viresh Kumar <viresh.kumar@...aro.org>
Subject: [PATCH 1/2] i2c-dev: don't get i2c adapter via i2c_dev

There is no code protecting i2c_dev to be freed after it is returned
from i2c_dev_get_by_minor() and using it to access the value which we
already have (minor) isn't safe really.

Avoid using it and get the adapter directly from 'minor'.

Signed-off-by: Viresh Kumar <viresh.kumar@...aro.org>
---
 drivers/i2c/i2c-dev.c | 7 +------
 1 file changed, 1 insertion(+), 6 deletions(-)

diff --git a/drivers/i2c/i2c-dev.c b/drivers/i2c/i2c-dev.c
index 6ecfd76270f2..66f323fd3982 100644
--- a/drivers/i2c/i2c-dev.c
+++ b/drivers/i2c/i2c-dev.c
@@ -485,13 +485,8 @@ static int i2cdev_open(struct inode *inode, struct file *file)
 	unsigned int minor = iminor(inode);
 	struct i2c_client *client;
 	struct i2c_adapter *adap;
-	struct i2c_dev *i2c_dev;
-
-	i2c_dev = i2c_dev_get_by_minor(minor);
-	if (!i2c_dev)
-		return -ENODEV;
 
-	adap = i2c_get_adapter(i2c_dev->adap->nr);
+	adap = i2c_get_adapter(minor);
 	if (!adap)
 		return -ENODEV;
 
-- 
2.7.4