pcmcia: synclink_cs: fix information leak to userland

Structure new_line is copied to userland with some padding fields unitialized.
It leads to leaking of stack memory.

Signed-off-by: Vasiliy Kulikov <segooon@gmail.com>
CC: stable@kernel.org
Signed-off-by: Dominik Brodowski <linux@dominikbrodowski.net>

1 files changed, 2 insertions, 0 deletions

diff --git a/drivers/char/pcmcia/synclink_cs.c b/drivers/char/pcmcia/synclink_cs.c
index d97a53cccdc5..be1810057607 100644
--- a/drivers/char/pcmcia/synclink_cs.c
+++ b/drivers/char/pcmcia/synclink_cs.c
@@ -4097,6 +4097,8 @@ static int hdlcdev_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
         if (cmd != SIOCWANDEV)
                 return hdlc_ioctl(dev, ifr, cmd);
 
+        memset(&new_line, 0, size);
+
         switch(ifr->ifr_settings.type) {
         case IF_GET_IFACE: /* return current sync_serial_settings */