linux-kernel - [PATCH 3.11 183/208] hamradio/yam: fix info leak in ioctl

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Message-Id: <1389628849-1614-184-git-send-email-luis.henriques@canonical.com>
Date:	Mon, 13 Jan 2014 16:00:24 +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 3.11 183/208] hamradio/yam: fix info leak in ioctl

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

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

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

commit 8e3fbf870481eb53b2d3a322d1fc395ad8b367ed upstream.

The yam_ioctl() code fails to initialise the cmd field
of the struct yamdrv_ioctl_cfg. Add an explicit memset(0)
before filling the structure to avoid the 4-byte 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/hamradio/yam.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/net/hamradio/yam.c b/drivers/net/hamradio/yam.c
index 0721e72..82529a2 100644
--- a/drivers/net/hamradio/yam.c
+++ b/drivers/net/hamradio/yam.c
@@ -1058,6 +1058,7 @@ static int yam_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
 		break;
 
 	case SIOCYAMGCFG:
+		memset(&yi, 0, sizeof(yi));
 		yi.cfg.mask = 0xffffffff;
 		yi.cfg.iobase = yp->iobase;
 		yi.cfg.irq = yp->irq;
-- 
1.8.3.2

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