netdev - [PATCH] wanxl: fix info leak in ioctl

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Message-Id: <1381920411-16981-1-git-send-email-speiro@ai2.upv.es>
Date:	Wed, 16 Oct 2013 12:46:50 +0200
From:	Salva Peiró <speiro@....upv.es>
To:	netdev@...r.kernel.org
CC:	security@...nel.org
Subject: [PATCH] wanxl: fix info leak in ioctl

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>
---
 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 6a24a5a..4c0a697 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;
--
1.7.10.4

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