diff options
| author | Tao Ren <taoren@fb.com> | 2019-04-24 01:43:32 +0000 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2019-04-23 21:15:15 -0700 |
| commit | 1c5c12ee308aacf635c8819cd4baa3bd58f8a8b7 (patch) | |
| tree | 1c1ca7d6585c26d35d0e5f06288c9337a4052243 /net/ncsi | |
| parent | ffbf9870dcf1342592a1a26f4cf70bda39046134 (diff) | |
| download | lwn-1c5c12ee308aacf635c8819cd4baa3bd58f8a8b7.tar.gz lwn-1c5c12ee308aacf635c8819cd4baa3bd58f8a8b7.zip | |
net/ncsi: handle overflow when incrementing mac address
Previously BMC's MAC address is calculated by simply adding 1 to the
last byte of network controller's MAC address, and it produces incorrect
result when network controller's MAC address ends with 0xFF.
The problem can be fixed by calling eth_addr_inc() function to increment
MAC address; besides, the MAC address is also validated before assigning
to BMC.
Fixes: cb10c7c0dfd9 ("net/ncsi: Add NCSI Broadcom OEM command")
Signed-off-by: Tao Ren <taoren@fb.com>
Acked-by: Jakub Kicinski <jakub.kicinski@netronome.com>
Acked-by: Samuel Mendoza-Jonas <sam@mendozajonas.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/ncsi')
| -rw-r--r-- | net/ncsi/ncsi-rsp.c | 6 |
1 files changed, 5 insertions, 1 deletions
diff --git a/net/ncsi/ncsi-rsp.c b/net/ncsi/ncsi-rsp.c index dc07fcc7938e..802db01e3075 100644 --- a/net/ncsi/ncsi-rsp.c +++ b/net/ncsi/ncsi-rsp.c @@ -11,6 +11,7 @@ #include <linux/kernel.h> #include <linux/init.h> #include <linux/netdevice.h> +#include <linux/etherdevice.h> #include <linux/skbuff.h> #include <net/ncsi.h> @@ -667,7 +668,10 @@ static int ncsi_rsp_handler_oem_bcm_gma(struct ncsi_request *nr) ndev->priv_flags |= IFF_LIVE_ADDR_CHANGE; memcpy(saddr.sa_data, &rsp->data[BCM_MAC_ADDR_OFFSET], ETH_ALEN); /* Increase mac address by 1 for BMC's address */ - saddr.sa_data[ETH_ALEN - 1]++; + eth_addr_inc((u8 *)saddr.sa_data); + if (!is_valid_ether_addr((const u8 *)saddr.sa_data)) + return -ENXIO; + ret = ops->ndo_set_mac_address(ndev, &saddr); if (ret < 0) netdev_warn(ndev, "NCSI: 'Writing mac address to device failed\n"); |