linux-kernel - [34-longterm 222/260] pcmcia: synclink_cs: fix information leak to userland

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Message-Id: <1293952756-15010-223-git-send-email-paul.gortmaker@windriver.com>
Date:	Sun,  2 Jan 2011 02:18:38 -0500
From:	Paul Gortmaker <paul.gortmaker@...driver.com>
To:	stable@...nel.org, linux-kernel@...r.kernel.org
Cc:	stable-review@...nel.org, Vasiliy Kulikov <segooon@...il.com>,
	Dominik Brodowski <linux@...inikbrodowski.net>,
	Paul Gortmaker <paul.gortmaker@...driver.com>
Subject: [34-longterm 222/260] pcmcia: synclink_cs: fix information leak to userland

From: Vasiliy Kulikov <segooon@...il.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@...il.com>
Signed-off-by: Dominik Brodowski <linux@...inikbrodowski.net>
Signed-off-by: Paul Gortmaker <paul.gortmaker@...driver.com>
---
 drivers/char/pcmcia/synclink_cs.c |    2 ++
 1 files changed, 2 insertions(+), 0 deletions(-)

diff --git a/drivers/char/pcmcia/synclink_cs.c b/drivers/char/pcmcia/synclink_cs.c
index c31a0d9..1165503 100644
--- a/drivers/char/pcmcia/synclink_cs.c
+++ b/drivers/char/pcmcia/synclink_cs.c
@@ -4144,6 +4144,8 @@ 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 */
 
-- 
1.7.3.3

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