macsec: restrict to ethernet devices
[ 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>
diff --git a/drivers/net/macsec.c b/drivers/net/macsec.c
index 8c64b06..da8bf32 100644
--- a/drivers/net/macsec.c
+++ b/drivers/net/macsec.c
@@ -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 @@
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;