ethtool: Use kcalloc instead of kmalloc for ethtool_get_strings

[ 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: Ben Hutchings <ben@decadent.org.uk>
(cherry picked from commit 68c3e59aa9cdf2d8870d8fbe4f37b1a509d0abeb)

Signed-off-by: Willy Tarreau <w@1wt.eu>

diff --git a/net/core/ethtool.c b/net/core/ethtool.c
index f9e7179dedf9750e331e9cd4f5889bdf62f2b9eb..ed17505925479b55698d201b0d689423752a77ad 100644 (file)
--- a/net/core/ethtool.c
+++ b/net/core/ethtool.c
@@ -794,7 +794,7 @@ static int ethtool_get_strings(struct net_device *dev, void __user *useraddr)
                }
        }
 
-       data = kmalloc(gstrings.len * ETH_GSTRING_LEN, GFP_USER);
+       data = kcalloc(gstrings.len, ETH_GSTRING_LEN, GFP_USER);
        if (!data)
                return -ENOMEM;