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

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Date:	Fri, 13 Dec 2013 08:46:07 +0100
From:	Salva Peiró <speiro@....upv.es>
To:	linux-kernel@...r.kernel.org
Cc:	<security@...nel.org>, <linux-hams@...r.kernel.org>,
	<netdev@...r.kernel.org>, Jean-Paul Roubelat <jpr@...bb.org>,
	Salva Peiró <speiro@....upv.es>,
	<stable@...r.kernel.org>
Subject: [PATCH] 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..bb02c8a 100644
--- a/drivers/net/hamradio/yam.c
+++ b/drivers/net/hamradio/yam.c
@@ -953,6 +953,7 @@ static int yam_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
 	struct yamdrv_ioctl_mcs *ym;
 	int ioctl_cmd;
 
+	memset(&yi, 0, sizeof(yi));
 	if (copy_from_user(&ioctl_cmd, ifr->ifr_data, sizeof(int)))
 		 return -EFAULT;
 
-- 
1.7.10.4

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