| From: Vlad Tsyrklevich <vlad@tsyrklevich.net> |
| Date: Mon, 9 Jan 2017 22:53:36 +0700 |
| Subject: i2c: fix kernel memory disclosure in dev interface |
| |
| commit 30f939feaeee23e21391cfc7b484f012eb189c3c upstream. |
| |
| i2c_smbus_xfer() does not always fill an entire block, allowing |
| kernel stack memory disclosure through the temp variable. Clear |
| it before it's read to. |
| |
| Signed-off-by: Vlad Tsyrklevich <vlad@tsyrklevich.net> |
| Signed-off-by: Wolfram Sang <wsa@the-dreams.de> |
| Signed-off-by: Ben Hutchings <ben@decadent.org.uk> |
| --- |
| drivers/i2c/i2c-dev.c | 2 +- |
| 1 file changed, 1 insertion(+), 1 deletion(-) |
| |
| --- a/drivers/i2c/i2c-dev.c |
| +++ b/drivers/i2c/i2c-dev.c |
| @@ -310,7 +310,7 @@ static noinline int i2cdev_ioctl_smbus(s |
| unsigned long arg) |
| { |
| struct i2c_smbus_ioctl_data data_arg; |
| - union i2c_smbus_data temp; |
| + union i2c_smbus_data temp = {}; |
| int datasize, res; |
| |
| if (copy_from_user(&data_arg, |
