3.2.87-rc1 review patch. If anyone has any objections, please let me know. ------------------ From: Vlad Tsyrklevich <vlad@xxxxxxxxxxxxxxx> 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@xxxxxxxxxxxxxxx> Signed-off-by: Wolfram Sang <wsa@xxxxxxxxxxxxx> Signed-off-by: Ben Hutchings <ben@xxxxxxxxxxxxxxx> --- 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,