netdev - [PATCH] ethtool: fix a kernel infoleak in ethtool_get

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Date:	Wed,  1 Jun 2016 16:39:21 +0200
From:	Kangjie Lu <kangjielu@...il.com>
To:	davem@...emloft.net
Cc:	ben@...adent.org.uk, kan.liang@...el.com, netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org, taesoo@...ech.edu,
	csong84@...ech.edu, Kangjie Lu <kjlu@...ech.edu>
Subject: [PATCH] ethtool: fix a kernel infoleak in ethtool_get_pauseparam

The field autoneg of pauseparam is not initialized in some
implementations of get_pauseparam(), but the whole object is
copied to userland.

Signed-off-by: Kangjie Lu <kjlu@...ech.edu>
---
 net/core/ethtool.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/net/core/ethtool.c b/net/core/ethtool.c
index f426c5a..84544bd 100644
--- a/net/core/ethtool.c
+++ b/net/core/ethtool.c
@@ -1723,7 +1723,10 @@ static noinline_for_stack int ethtool_set_channels(struct net_device *dev,
 
 static int ethtool_get_pauseparam(struct net_device *dev, void __user *useraddr)
 {
-	struct ethtool_pauseparam pauseparam = { ETHTOOL_GPAUSEPARAM };
+	struct ethtool_pauseparam pauseparam;
+
+	memset(&pauseparam, 0, sizeof(pauseparam));
+	pauseparam.cmd = ETHTOOL_GPAUSEPARAM;
 
 	if (!dev->ethtool_ops->get_pauseparam)
 		return -EOPNOTSUPP;
-- 
1.9.1