[PATCH 4.2 18/54] ethtool: Use kcalloc instead of kmalloc for ethtool_get_strings

From	Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Newsgroups	linux.kernel
Subject	[PATCH 4.2 18/54] ethtool: Use kcalloc instead of kmalloc for ethtool_get_strings
Date	2015-10-23 20:20 +0200
Message-ID	<qmP6B-Po-59@gated-at.bofh.it> (permalink)
References	<qmODw-8sm-7@gated-at.bofh.it>
Organization	linux.* mail to news gateway

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

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

From: Joe Perches <joe@perches.com>

[ Upstream commit 077cb37fcf6f00a45f375161200b5ee0cd4e937b ]

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@perches.com>
Acked-by: Ben Hutchings <ben@decadent.org.uk>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
 net/core/ethtool.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/net/core/ethtool.c
+++ b/net/core/ethtool.c
@@ -1284,7 +1284,7 @@ static int ethtool_get_strings(struct ne
 
 	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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[PATCH 4.2 18/54] ethtool: Use kcalloc instead of kmalloc for ethtool_get_strings Greg Kroah-Hartman <gregkh@linuxfoundation.org> - 2015-10-23 20:20 +0200

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