Commit d6f6e3f9 authored by Lijun Pan's avatar Lijun Pan Committed by Greg Kroah-Hartman
Browse files

ibmvnic: fix ibmvnic_set_mac

[ 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: c26eba03

 ("ibmvnic: Update reset infrastructure to support tunable parameters")
Signed-off-by: default avatarLijun Pan <ljp@linux.ibm.com>
Link: https://lore.kernel.org/r/20201027220456.71450-1-ljp@linux.ibm.com

Signed-off-by: default avatarJakub Kicinski <kuba@kernel.org>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent 4606d351
......@@ -1828,9 +1828,13 @@ static int ibmvnic_set_mac(struct net_device *netdev, void *p)
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;
}
......
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