[patch v2 -next] wan/fsl_ucc_hdlc: info leak in uhdlc_ioctl()

[Dan Carpenter]

There is a 2 byte struct whole after line.loopback so we need to clear
that out to avoid disclosing stack information.

Fixes: c19b6d246a35 ('drivers/net: support hdlc function for QE-UCC')
Signed-off-by: Dan Carpenter <dan.carpen...@oracle.com>
---
v2: remove the other initialization to zero

diff --git a/drivers/net/wan/fsl_ucc_hdlc.c b/drivers/net/wan/fsl_ucc_hdlc.c
index 19174ac..6edd48a 100644
--- a/drivers/net/wan/fsl_ucc_hdlc.c
+++ b/drivers/net/wan/fsl_ucc_hdlc.c
@@ -635,9 +635,8 @@ static int uhdlc_ioctl(struct net_device *dev, struct ifreq 
*ifr, int cmd)
                        ifr->ifr_settings.size = size; /* data size wanted */
                        return -ENOBUFS;
                }
+               memset(&line, 0, sizeof(line));
                line.clock_type = priv->clocking;
-               line.clock_rate = 0;
-               line.loopback = 0;
 
                if (copy_to_user(ifr->ifr_settings.ifs_ifsu.sync, &line, size))
                        return -EFAULT;