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

From: Willy Tarreau
Date: Tue Jun 04 2013 - 19:03:44 EST

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


From: Mathias Krause <minipli@xxxxxxxxxxxxxx>

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@xxxxxxxxxxxxxx>
Signed-off-by: David S. Miller <davem@xxxxxxxxxxxxx>
[bwh: Backported to 2.6.32: adjust context]
Signed-off-by: Willy Tarreau <w@xxxxxx>
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;

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