From: Jaco Coetzee jaco.coetzee@corigine.com
[ Upstream commit 0873016d46f6dfafd1bdf4d9b935b3331b226f7c ]
Setting of the port flag `NFP_PORT_CHANGED`, introduced to ensure the correct reading of EEPROM data, causes a fatal kernel NULL pointer dereference in cases where the target netdev type cannot be determined.
Add validation of port struct pointer before attempting to set the `NFP_PORT_CHANGED` flag. Return that operation is not supported if the netdev type cannot be determined.
Fixes: 4ae97cae07e1 ("nfp: ethtool: fix the display error of `ethtool -m DEVNAME`") Signed-off-by: Jaco Coetzee jaco.coetzee@corigine.com Reviewed-by: Louis Peens louis.peens@corigine.com Signed-off-by: Simon Horman simon.horman@corigine.com Signed-off-by: Jakub Kicinski kuba@kernel.org Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/net/ethernet/netronome/nfp/nfp_net_ethtool.c | 3 +++ 1 file changed, 3 insertions(+)
diff --git a/drivers/net/ethernet/netronome/nfp/nfp_net_ethtool.c b/drivers/net/ethernet/netronome/nfp/nfp_net_ethtool.c index b19bff0db1fd..400b22ad6a34 100644 --- a/drivers/net/ethernet/netronome/nfp/nfp_net_ethtool.c +++ b/drivers/net/ethernet/netronome/nfp/nfp_net_ethtool.c @@ -1395,6 +1395,9 @@ nfp_port_get_module_info(struct net_device *netdev, u8 data;
port = nfp_port_from_netdev(netdev); + if (!port) + return -EOPNOTSUPP; + /* update port state to get latest interface */ set_bit(NFP_PORT_CHANGED, &port->flags); eth_port = nfp_port_get_eth_port(port);