linux-kernel - [PATCH 3.2 11/87] farsync: fix info leak in ioctl

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Message-ID: <lsq.1385387069.479901329@decadent.org.uk>
Date:	Mon, 25 Nov 2013 13:44:29 +0000
From:	Ben Hutchings <ben@...adent.org.uk>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org
CC:	akpm@...ux-foundation.org,
	"Dan Carpenter" <dan.carpenter@...cle.com>,
	"David S. Miller" <davem@...emloft.net>,
	"Salva Peiró" <speiro@....upv.es>
Subject: [PATCH 3.2 11/87] farsync: fix info leak in ioctl

3.2.53-rc1 review patch.  If anyone has any objections, please let me know.

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

From: Salva Peiró <speiro@....upv.es>

[ Upstream commit 96b340406724d87e4621284ebac5e059d67b2194 ]

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@...cle.com>
Signed-off-by: David S. Miller <davem@...emloft.net>
Signed-off-by: Ben Hutchings <ben@...adent.org.uk>
---
 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 ebb9f24..7a4c491 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) ==

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