[07/82] pcmcia: synclink_cs: fix information leak to userland

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From: Greg KH
Date: Friday, November 19, 2010 - 2:55 pm

2.6.35-stable review patch.  If anyone has any objections, please let us know.

------------------

From: Vasiliy Kulikov <segooon@gmail.com>

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>

---
 drivers/char/pcmcia/synclink_cs.c |    2 ++
 1 file changed, 2 insertions(+)

--- a/drivers/char/pcmcia/synclink_cs.c
+++ b/drivers/char/pcmcia/synclink_cs.c
@@ -4132,6 +4132,8 @@ static int hdlcdev_ioctl(struct net_devi
 	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 */
 


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[07/82] pcmcia: synclink_cs: fix information leak to userland, Greg KH, (Fri Nov 19, 2:55 pm)