linux-kernel - [ 038/143] wanxl: fix info leak in ioctl

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Message-Id: <20140512003202.222981268@1wt.eu>
Date:	Mon, 12 May 2014 02:32:38 +0200
From:	Willy Tarreau <w@....eu>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:	Salva PeirĂł <speiro@....upv.es>,
	"David S. Miller" <davem@...emloft.net>, Willy Tarreau <w@....eu>
Subject: [ 038/143] wanxl: fix info leak in ioctl

2.6.32-longterm review patch.  If anyone has any objections, please let me know.

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

From: =?latin1?q?Salva=20Peir=F3?= <speiro@....upv.es>

[ Upstream commit 2b13d06c9584b4eb773f1e80bbaedab9a1c344e1 ]

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: Willy Tarreau <w@....eu>
---
 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 daee8a0..b52b378 100644
--- a/drivers/net/wan/wanxl.c
+++ b/drivers/net/wan/wanxl.c
@@ -354,6 +354,7 @@ 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;
-- 
1.7.12.2.21.g234cd45.dirty



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