From: viresh kumar viresh.kumar@linaro.org
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 --- 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 e5cd307ebfc9..5543b49e2e05 100644 --- a/drivers/i2c/i2c-dev.c +++ b/drivers/i2c/i2c-dev.c @@ -492,13 +492,8 @@ 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;