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wan/fsl_ucc_hdlc: info leak in uhdlc_ioctl()

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

Fixes: c19b6d246a ('drivers/net: support hdlc function for QE-UCC')
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Dan Carpenter 2016-07-14 14:16:53 +03:00 committed by David S. Miller
parent 7a7d1d5733
commit 2f43b9beea
1 changed files with 1 additions and 2 deletions
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drivers/net/wan/fsl_ucc_hdlc.c
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@ -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;