[PATCH 3.5 50/64] farsync: fix info leak in ioctl

[Luis Henriques]

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

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

From: =?UTF-8?q?Salva=20Peir=C3=B3?= <speiro@xxxxxxxxxx>

commit 96b340406724d87e4621284ebac5e059d67b2194 upstream.

The fst_get_iface() code fails to initialize the two padding bytes of
struct sync_serial_settings after the ->loopback member. Add an explicit
memset(0) before filling the structure to avoid the info leak.

Signed-off-by: Dan Carpenter <dan.carpenter@xxxxxxxxxx>
Signed-off-by: David S. Miller <davem@xxxxxxxxxxxxx>
Signed-off-by: Luis Henriques <luis.henriques@xxxxxxxxxxxxx>
---
 drivers/net/wan/farsync.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/net/wan/farsync.c b/drivers/net/wan/farsync.c
index 1a62318..3710427 100644
--- a/drivers/net/wan/farsync.c
+++ b/drivers/net/wan/farsync.c
@@ -1972,6 +1972,7 @@ fst_get_iface(struct fst_card_info *card, struct fst_port_info *port,
 	}
 
 	i = port->index;
+	memset(&sync, 0, sizeof(sync));
 	sync.clock_rate = FST_RDL(card, portConfig[i].lineSpeed);
 	/* Lucky card and linux use same encoding here */
 	sync.clock_type = FST_RDB(card, portConfig[i].internalClock) ==
-- 
1.8.3.2

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