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Date:	Mon, 17 Sep 2012 01:37:22 +0100
From:	Ben Hutchings <>
Cc:,,, Mathias Krause <>,
	"David S. Miller" <>
Subject: [ 057/135] atm: fix info leak in getsockopt(SO_ATMPVC)

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


From: Mathias Krause <>

[ Upstream commit e862f1a9b7df4e8196ebec45ac62295138aa3fc2 ]

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 <>
Signed-off-by: David S. Miller <>
Signed-off-by: Ben Hutchings <>
 net/atm/common.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/net/atm/common.c b/net/atm/common.c
index 14ff9fe..0ca06e8 100644
--- a/net/atm/common.c
+++ b/net/atm/common.c
@@ -784,6 +784,7 @@ 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;

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