This is a note to let you know that I've just added the patch titled [PATCH stable 5.8 12/22] ibmvnic: fix ibmvnic_set_mac to the 5.8-stable tree which can be found at: http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary The filename of the patch is: ibmvnic-fix-ibmvnic_set_mac.patch and it can be found in the queue-5.8 subdirectory. If you, or anyone else, feels it should not be added to the stable tree, please let <stable@xxxxxxxxxxxxxxx> know about it. >From foo@baz Sat Oct 31 09:06:02 AM CET 2020 From: Lijun Pan <ljp@xxxxxxxxxxxxx> Date: Tue, 27 Oct 2020 17:04:56 -0500 Subject: [PATCH stable 5.8 12/22] ibmvnic: fix ibmvnic_set_mac From: Lijun Pan <ljp@xxxxxxxxxxxxx> [ 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@xxxxxxxxxxxxx> Link: https://lore.kernel.org/r/20201027220456.71450-1-ljp@xxxxxxxxxxxxx Signed-off-by: Jakub Kicinski <kuba@xxxxxxxxxx> Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx> --- 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 @@ -1828,9 +1828,13 @@ 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; } Patches currently in stable-queue which might be from ljp@xxxxxxxxxxxxx are queue-5.8/ibmvnic-fix-ibmvnic_set_mac.patch