[PATCH 3.14 09/25] ethtool: Use kcalloc instead of kmalloc for ethtool_get_strings

From: Greg Kroah-Hartman
Date: Fri Oct 23 2015 - 14:10:34 EST


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

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

From: Joe Perches <joe@xxxxxxxxxxx>

[ 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@xxxxxxxxxxx>
Acked-by: Ben Hutchings <ben@xxxxxxxxxxxxxxx>
Signed-off-by: David S. Miller <davem@xxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
net/core/ethtool.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)

--- a/net/core/ethtool.c
+++ b/net/core/ethtool.c
@@ -1080,7 +1080,7 @@ 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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