| From | Kamal Mostafa <> | Subject | [PATCH 3.13.y-ckt 57/96] ethtool: Use kcalloc instead of kmalloc for ethtool_get_strings | Date | Fri, 13 Nov 2015 13:49:11 -0800 |
| |
3.13.11-ckt30 -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: Kamal Mostafa <kamal@canonical.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 30071de..0b39ab6 100644 --- a/net/core/ethtool.c +++ b/net/core/ethtool.c @@ -1080,7 +1080,7 @@ 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; -- 1.9.1
|