netdev - [PATCH v2] hamradio/yam: fix info leak in ioctl

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Date:	Tue, 17 Dec 2013 10:06:30 +0100
From:	Salva Peiró <speiro@....upv.es>
To:	linux-kernel@...r.kernel.org
Cc:	Salva Peiró <speiro@....upv.es>,
	security@...nel.org, linux-hams@...r.kernel.org,
	netdev@...r.kernel.org, Jean-Paul Roubelat <jpr@...bb.org>,
	stable@...r.kernel.org
Subject: [PATCH v2] hamradio/yam: fix info leak in ioctl

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>
CC: <stable@...r.kernel.org>
---
 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 1971411..61dd244 100644
--- a/drivers/net/hamradio/yam.c
+++ b/drivers/net/hamradio/yam.c
@@ -1057,6 +1057,7 @@ 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;
-- 
1.7.10.4

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