[PATCH net-next] liquidio: fix PF falsely indicating success at setting MAC address of a nonexistent VF

[Felix Manlunas]

In the function assigned to .ndo_set_vf_mac, check the validity of the
vfidx argument before proceeding to tell the firmware to set the VF MAC
address.

Signed-off-by: Felix Manlunas <felix.manlu...@cavium.com>
Signed-off-by: Derek Chickles <derek.chick...@cavium.com>
---
 drivers/net/ethernet/cavium/liquidio/lio_main.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/net/ethernet/cavium/liquidio/lio_main.c 
b/drivers/net/ethernet/cavium/liquidio/lio_main.c
index 927617c..eed6ff0 100644
--- a/drivers/net/ethernet/cavium/liquidio/lio_main.c
+++ b/drivers/net/ethernet/cavium/liquidio/lio_main.c
@@ -3694,6 +3694,9 @@ static int liquidio_set_vf_mac(struct net_device *netdev, 
int vfidx, u8 *mac)
        struct octeon_device *oct = lio->oct_dev;
        int retval;
 
+       if (vfidx < 0 || vfidx >= oct->sriov_info.num_vfs_alloced)
+               return -EINVAL;
+
        retval = __liquidio_set_vf_mac(netdev, vfidx, mac, true);
        if (!retval)
                cn23xx_tell_vf_its_macaddr_changed(oct, vfidx, mac);