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macsec: restrict to ethernet devices

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[ Upstream commit b06d072ccc4b1acd0147b17914b7ad1caa1818bb ]

Only attach macsec to ethernet devices.

Syzbot was able to trigger a KMSAN warning in macsec_handle_frame
by attaching to a phonet device.

Macvlan has a similar check in macvlan_port_create.

v1->v2
  - fix commit message typo

Reported-by: syzbot <syzkaller@googlegroups.com>
Signed-off-by: Willem de Bruijn <willemb@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Willem de Bruijn 2020-03-22 13:51:13 -04:00 committed by Greg Kroah-Hartman
parent b597b0c42f
commit dccb6b9beb
1 changed files with 3 additions and 0 deletions
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3
drivers/net/macsec.c
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@ -19,6 +19,7 @@
#include <net/genetlink.h>
#include <net/sock.h>
#include <net/gro_cells.h>
#include <linux/if_arp.h>
#include <uapi/linux/if_macsec.h>
@ -3219,6 +3220,8 @@ static int macsec_newlink(struct net *net, struct net_device *dev,
real_dev = __dev_get_by_index(net, nla_get_u32(tb[IFLA_LINK]));
if (!real_dev)
return -ENODEV;
if (real_dev->type != ARPHRD_ETHER)
return -EINVAL;
dev->priv_flags |= IFF_MACSEC;