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: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/i2c/i2c-dev.c b/drivers/i2c/i2c-dev.c
index 2413ec9f8207eeffcfbeeb5480043e4651fdf15a..94c837046786ad986fa562b2394f56872bd379f2 100644 (file)
--- a/drivers/i2c/i2c-dev.c
+++ b/drivers/i2c/i2c-dev.c
@@ -329,7 +329,7 @@ static noinline int i2cdev_ioctl_smbus(struct i2c_client *client,
                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,