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path: root/drivers/net/macsec.c
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Diffstat (limited to 'drivers/net/macsec.c')
-rw-r--r--drivers/net/macsec.c12
1 files changed, 8 insertions, 4 deletions
diff --git a/drivers/net/macsec.c b/drivers/net/macsec.c
index a183250ff66a..758baf7cb8a1 100644
--- a/drivers/net/macsec.c
+++ b/drivers/net/macsec.c
@@ -4002,11 +4002,11 @@ static int macsec_newlink(struct net *net, struct net_device *dev,
struct netlink_ext_ack *extack)
{
struct macsec_dev *macsec = macsec_priv(dev);
+ rx_handler_func_t *rx_handler;
+ u8 icv_len = DEFAULT_ICV_LEN;
struct net_device *real_dev;
- int err;
+ int err, mtu;
sci_t sci;
- u8 icv_len = DEFAULT_ICV_LEN;
- rx_handler_func_t *rx_handler;
if (!tb[IFLA_LINK])
return -EINVAL;
@@ -4033,7 +4033,11 @@ static int macsec_newlink(struct net *net, struct net_device *dev,
if (data && data[IFLA_MACSEC_ICV_LEN])
icv_len = nla_get_u8(data[IFLA_MACSEC_ICV_LEN]);
- dev->mtu = real_dev->mtu - icv_len - macsec_extra_len(true);
+ mtu = real_dev->mtu - icv_len - macsec_extra_len(true);
+ if (mtu < 0)
+ dev->mtu = 0;
+ else
+ dev->mtu = mtu;
rx_handler = rtnl_dereference(real_dev->rx_handler);
if (rx_handler && rx_handler != macsec_handle_frame)