Commit 077cb37f authored by Joe Perches's avatar Joe Perches Committed by David S. Miller

ethtool: Use kcalloc instead of kmalloc for ethtool_get_strings

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: default avatarJoe Perches <joe@perches.com>
Acked-by: default avatarBen Hutchings <ben@decadent.org.uk>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent ef41a2ce
...@@ -1284,7 +1284,7 @@ static int ethtool_get_strings(struct net_device *dev, void __user *useraddr) ...@@ -1284,7 +1284,7 @@ static int ethtool_get_strings(struct net_device *dev, void __user *useraddr)
gstrings.len = ret; gstrings.len = ret;
data = kmalloc(gstrings.len * ETH_GSTRING_LEN, GFP_USER); data = kcalloc(gstrings.len, ETH_GSTRING_LEN, GFP_USER);
if (!data) if (!data)
return -ENOMEM; return -ENOMEM;
......
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