linux-kernel - [ 073/102] ipv6,gre: do not leak info to user-space

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Date:	Fri, 17 May 2013 14:36:28 -0700
From:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:	linux-kernel@...r.kernel.org
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	stable@...r.kernel.org, "David S. Miller" <davem@...emloft.net>,
	Cong Wang <amwang@...hat.com>
Subject: [ 073/102] ipv6,gre: do not leak info to user-space

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

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


From: Amerigo Wang <amwang@...hat.com>

[ Upstream commit 5dbd5068430b8bd1c19387d46d6c1a88b261257f ]

There is a hole in struct ip6_tnl_parm2, so we have to
zero the struct on stack before copying it to user-space.

Cc: David S. Miller <davem@...emloft.net>
Signed-off-by: Cong Wang <amwang@...hat.com>
Signed-off-by: David S. Miller <davem@...emloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 net/ipv6/ip6_gre.c |    2 ++
 1 file changed, 2 insertions(+)

--- a/net/ipv6/ip6_gre.c
+++ b/net/ipv6/ip6_gre.c
@@ -1135,6 +1135,7 @@ static int ip6gre_tunnel_ioctl(struct ne
 		}
 		if (t == NULL)
 			t = netdev_priv(dev);
+		memset(&p, 0, sizeof(p));
 		ip6gre_tnl_parm_to_user(&p, &t->parms);
 		if (copy_to_user(ifr->ifr_ifru.ifru_data, &p, sizeof(p)))
 			err = -EFAULT;
@@ -1182,6 +1183,7 @@ static int ip6gre_tunnel_ioctl(struct ne
 		if (t) {
 			err = 0;
 
+			memset(&p, 0, sizeof(p));
 			ip6gre_tnl_parm_to_user(&p, &t->parms);
 			if (copy_to_user(ifr->ifr_ifru.ifru_data, &p, sizeof(p)))
 				err = -EFAULT;


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