linux-kernel - [ 174/184] atm: fix info leak via getsockname()

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Message-Id: <20130604172137.519858074@1wt.eu>
Date:	Tue, 04 Jun 2013 19:24:24 +0200
From:	Willy Tarreau <w@....eu>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:	Mathias Krause <minipli@...glemail.com>,
	"David S. Miller" <davem@...emloft.net>, Willy Tarreau <w@....eu>
Subject: [ 174/184] atm: fix info leak via getsockname()

2.6.32-longterm review patch.  If anyone has any objections, please let me know.

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

From: Mathias Krause <minipli@...glemail.com>

commit 3c0c5cfdcd4d69ffc4b9c0907cec99039f30a50a upstream.

The ATM code fails to initialize the two padding bytes of struct
sockaddr_atmpvc inserted for alignment. Add an explicit memset(0)
before filling the structure to avoid the info leak.

Signed-off-by: Mathias Krause <minipli@...glemail.com>
Signed-off-by: David S. Miller <davem@...emloft.net>
[bwh: Backported to 2.6.32: adjust context]
Signed-off-by: Willy Tarreau <w@....eu>
---
 net/atm/pvc.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/net/atm/pvc.c b/net/atm/pvc.c
index d4c0245..523c21a 100644
--- a/net/atm/pvc.c
+++ b/net/atm/pvc.c
@@ -93,6 +93,7 @@ static int pvc_getname(struct socket *sock,struct sockaddr *sockaddr,
 	if (!vcc->dev || !test_bit(ATM_VF_ADDR,&vcc->flags)) return -ENOTCONN;
 	*sockaddr_len = sizeof(struct sockaddr_atmpvc);
 	addr = (struct sockaddr_atmpvc *) sockaddr;
+	memset(addr, 0, sizeof(*addr));
 	addr->sap_family = AF_ATMPVC;
 	addr->sap_addr.itf = vcc->dev->number;
 	addr->sap_addr.vpi = vcc->vpi;
-- 
1.7.12.2.21.g234cd45.dirty



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