On Thu, Mar 14, 2019 at 06:37:29PM +0800, Feng Tang wrote: > There is a panic reported that on a system with x722 ethernet, > when doing the operations like: > #ip link add br0 type bridge > #ip link set eno1 master br0 > #systemctl restart systemd-networkd > > The system will panic "BUG: unable to handle kernel null pointer > dereference at 0000000000000034", with call chain: > > i40iw_inetaddr_event > notifier_call_chain > blocking_notifier_call_chain > notifier_call_chain > __inet_del_ifa > inet_rtm_deladdr > rtnetlink_rcv_msg > netlink_rcv_skb > rtnetlink_rcv > netlink_unicast > netlink_sendmsg > sock_sendmsg > __sys_sendto > > It is caused by "local_ipaddr = ntohl(in->ifa_list->ifa_address)", > while the in->ifa_list is NULL. > > So add a check for the "in->ifa_list == NULL" case, and skip > the ARP operation accordingly. > > Signed-off-by: Feng Tang <feng.tang@xxxxxxxxx> > --- > drivers/infiniband/hw/i40iw/i40iw_utils.c | 12 +++++++++++- > 1 file changed, 11 insertions(+), 1 deletion(-) Applied to for-rc Thanks, Jason
