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

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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>
This commit is contained in:
viresh kumar 2016-07-05 19:57:06 -07:00 committed by Wolfram Sang
parent ec2790e9d7
commit 5136ed4fcb
1 changed files with 1 additions and 6 deletions
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7
drivers/i2c/i2c-dev.c
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@ -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;