From: Lijun Pan ljp@linux.ibm.com
[ Upstream commit 8fc3672a8ad3e782bac80e979bc2a2c10960cbe9 ]
Jakub Kicinski brought up a concern in ibmvnic_set_mac(). ibmvnic_set_mac() does this:
ether_addr_copy(adapter->mac_addr, addr->sa_data); if (adapter->state != VNIC_PROBED) rc = __ibmvnic_set_mac(netdev, addr->sa_data);
So if state == VNIC_PROBED, the user can assign an invalid address to adapter->mac_addr, and ibmvnic_set_mac() will still return 0.
The fix is to validate ethernet address at the beginning of ibmvnic_set_mac(), and move the ether_addr_copy to the case of "adapter->state != VNIC_PROBED".
Fixes: c26eba03e407 ("ibmvnic: Update reset infrastructure to support tunable parameters") Signed-off-by: Lijun Pan ljp@linux.ibm.com Link: https://lore.kernel.org/r/20201027220456.71450-1-ljp@linux.ibm.com Signed-off-by: Jakub Kicinski kuba@kernel.org Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- drivers/net/ethernet/ibm/ibmvnic.c | 8 ++++++-- 1 file changed, 6 insertions(+), 2 deletions(-)
--- a/drivers/net/ethernet/ibm/ibmvnic.c +++ b/drivers/net/ethernet/ibm/ibmvnic.c @@ -1735,9 +1735,13 @@ static int ibmvnic_set_mac(struct net_de int rc;
rc = 0; - ether_addr_copy(adapter->mac_addr, addr->sa_data); - if (adapter->state != VNIC_PROBED) + if (!is_valid_ether_addr(addr->sa_data)) + return -EADDRNOTAVAIL; + + if (adapter->state != VNIC_PROBED) { + ether_addr_copy(adapter->mac_addr, addr->sa_data); rc = __ibmvnic_set_mac(netdev, addr->sa_data); + }
return rc; }