[patch v2 -next] wan/fsl_ucc_hdlc: info leak in uhdlc_ioctl()
From: Dan Carpenter <hidden>
Date: 2016-07-14 11:17:17
Also in:
kernel-janitors, netdev
Subsystem:
freescale quicc engine ucc hdlc driver, networking drivers, the rest · Maintainers:
Zhao Qiang, Andrew Lunn, "David S. Miller", Eric Dumazet, Jakub Kicinski, Paolo Abeni, Linus Torvalds
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 <redacted>
---
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;