linux-kernel - [PATCH 3.5 57/64] wanxl: fix info leak in ioctl

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Message-Id: <1382971703-17393-58-git-send-email-luis.henriques@canonical.com>
Date:	Mon, 28 Oct 2013 14:48:16 +0000
From:	Luis Henriques <luis.henriques@...onical.com>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org,
	kernel-team@...ts.ubuntu.com
Cc:	Salva Peiró <speiro@....upv.es>,
	"David S. Miller" <davem@...emloft.net>,
	Luis Henriques <luis.henriques@...onical.com>
Subject: [PATCH 3.5 57/64] wanxl: fix info leak in ioctl

3.5.7.24 -stable review patch.  If anyone has any objections, please let me know.

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

From: =?UTF-8?q?Salva=20Peir=C3=B3?= <speiro@....upv.es>

commit 2b13d06c9584b4eb773f1e80bbaedab9a1c344e1 upstream.

The wanxl_ioctl() code fails to initialize the two padding bytes of
struct sync_serial_settings after the ->loopback member. Add an explicit
memset(0) before filling the structure to avoid the info leak.

Signed-off-by: Salva Peiró <speiro@....upv.es>
Signed-off-by: David S. Miller <davem@...emloft.net>
Signed-off-by: Luis Henriques <luis.henriques@...onical.com>
---
 drivers/net/wan/wanxl.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/net/wan/wanxl.c b/drivers/net/wan/wanxl.c
index feb7541..ccd496b 100644
--- a/drivers/net/wan/wanxl.c
+++ b/drivers/net/wan/wanxl.c
@@ -355,6 +355,7 @@ static int wanxl_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 = get_status(port)->clocking;
 		line.clock_rate = 0;
 		line.loopback = 0;
-- 
1.8.3.2

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