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authorJoe Perches <joe@perches.com>2015-10-14 11:09:40 +0300
committerDavid S. Miller <davem@davemloft.net>2015-10-15 05:00:20 +0300
commit077cb37fcf6f00a45f375161200b5ee0cd4e937b (patch)
tree28e5684447aa0ca07b63a2c66e3bb8f29e7139f5 /net
parentef41a2cedb14871203ee28d7a5cb5aafe4e97439 (diff)
downloadlinux-077cb37fcf6f00a45f375161200b5ee0cd4e937b.tar.xz
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: Joe Perches <joe@perches.com> Acked-by: Ben Hutchings <ben@decadent.org.uk> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net')
-rw-r--r--net/core/ethtool.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/net/core/ethtool.c b/net/core/ethtool.c
index b495ab1797fa..29edf74846fc 100644
--- a/net/core/ethtool.c
+++ b/net/core/ethtool.c
@@ -1284,7 +1284,7 @@ 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;