linux-kernel - [ 175/184] atm: fix info leak in getsockopt(SO

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Message-Id: <20130604172137.561062802@1wt.eu>
Date:	Tue, 04 Jun 2013 19:24:25 +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: [ 175/184] atm: fix info leak in getsockopt(SO_ATMPVC)

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

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

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

commit e862f1a9b7df4e8196ebec45ac62295138aa3fc2 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, indentation]
Signed-off-by: Willy Tarreau <w@....eu>
---
 net/atm/common.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/net/atm/common.c b/net/atm/common.c
index 6c82d72..65737b8 100644
--- a/net/atm/common.c
+++ b/net/atm/common.c
@@ -751,6 +751,7 @@ int vcc_getsockopt(struct socket *sock, int level, int optname,
 				if (!vcc->dev ||
 				    !test_bit(ATM_VF_ADDR,&vcc->flags))
 					return -ENOTCONN;
+				memset(&pvc, 0, sizeof(pvc));
 				pvc.sap_family = AF_ATMPVC;
 				pvc.sap_addr.itf = vcc->dev->number;
 				pvc.sap_addr.vpi = vcc->vpi;
-- 
1.7.12.2.21.g234cd45.dirty



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