Commit 60c00ab0 authored Jul 05, 2016 by viresh kumar Committed by TARKZiM Aug 28, 2020

i2c-dev: don't get i2c adapter via i2c_dev



commit 5136ed4fcb05cd4981cc6034a11e66370ed84789 upstream.

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@linaro.org>
Reviewed-by: Jean Delvare <jdelvare@suse.de>
Tested-by: Jean Delvare <jdelvare@suse.de>
Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
Signed-off-by: Ben Hutchings <ben.hutchings@codethink.co.uk>
Signed-off-by: Sasha Levin <sashal@kernel.org>
Signed-off-by: Lee Jones <lee.jones@linaro.org>
Change-Id: Ie2d557a25ad889bcfc96d79e9680c79f078c0981

parent 43da13ff

drivers/i2c/i2c-dev.c

+1 −6

Original line number	Diff line number	Diff line
		@@ -495,13 +495,8 @@ 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;