linux-kernel - [PATCH 3.16.y-ckt 101/104] ethtool: Use kcalloc instead of kmalloc for ethtool_get

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Message-Id: <1445867006-18048-102-git-send-email-luis.henriques@canonical.com>
Date:	Mon, 26 Oct 2015 13:43:23 +0000
From:	Luis Henriques <luis.henriques@...onical.com>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org,
	kernel-team@...ts.ubuntu.com
Cc:	Joe Perches <joe@...ches.com>,
	"David S. Miller" <davem@...emloft.net>,
	Luis Henriques <luis.henriques@...onical.com>
Subject: [PATCH 3.16.y-ckt 101/104] ethtool: Use kcalloc instead of kmalloc for ethtool_get_strings

3.16.7-ckt19 -stable review patch.  If anyone has any objections, please let me know.

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

From: Joe Perches <joe@...ches.com>

commit 077cb37fcf6f00a45f375161200b5ee0cd4e937b upstream.

It seems that kernel memory can leak into userspace by a
kmalloc, ethtool_get_strings, then copy_to_user sequence.

Avoid this by using kcalloc to zero fill the copied buffer.

Signed-off-by: Joe Perches <joe@...ches.com>
Acked-by: Ben Hutchings <ben@...adent.org.uk>
Signed-off-by: David S. Miller <davem@...emloft.net>
Signed-off-by: Luis Henriques <luis.henriques@...onical.com>
---
 net/core/ethtool.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/net/core/ethtool.c b/net/core/ethtool.c
index 17cb912793fa..e264527e41f8 100644
--- a/net/core/ethtool.c
+++ b/net/core/ethtool.c
@@ -1255,7 +1255,7 @@ static int ethtool_get_strings(struct net_device *dev, void __user *useraddr)
 
 	gstrings.len = ret;
 
-	data = kmalloc(gstrings.len * ETH_GSTRING_LEN, GFP_USER);
+	data = kcalloc(gstrings.len, ETH_GSTRING_LEN, GFP_USER);
 	if (!data)
 		return -ENOMEM;
 
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