pcmcia: synclink_cs: fix information leak to userland

commit 5b917a1420d3d1a9c8da49fb0090692dc9aaee86 upstream.

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>
Signed-off-by: Dominik Brodowski <linux@dominikbrodowski.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

diff --git a/drivers/char/pcmcia/synclink_cs.c b/drivers/char/pcmcia/synclink_cs.c
index 9ecd6bef5d3b5457ec5bcc6566db7621c1d791f3..45f9fad4f5dcd32e927a9803eac807e2b05868fd 100644 (file)
--- a/drivers/char/pcmcia/synclink_cs.c
+++ b/drivers/char/pcmcia/synclink_cs.c
@@ -4127,6 +4127,8 @@ 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 */