CVE-2024-50298

In the Linux kernel, the following vulnerability has been resolved:

net: enetc: allocate vf_state during PF probes

In the previous implementation, vf_state is allocated memory only when VF

is enabled. However, net_device_ops::ndo_set_vf_mac() may be called before

VF is enabled to configure the MAC address of VF. If this is the case,

enetc_pf_set_vf_mac() will access vf_state, resulting in access to a null

pointer. The simplified error log is as follows.

root@ls1028ardb:~# ip link set eno0 vf 1 mac 00:0c:e7:66:77:89

[ 173.543315] Unable to handle kernel NULL pointer dereference at virtual address 0000000000000004

[ 173.637254] pc : enetc_pf_set_vf_mac+0x3c/0x80 Message from sy

[ 173.641973] lr : do_setlink+0x4a8/0xec8

[ 173.732292] Call trace:

[ 173.734740] enetc_pf_set_vf_mac+0x3c/0x80

[ 173.738847] __rtnl_newlink+0x530/0x89c

[ 173.742692] rtnl_newlink+0x50/0x7c

[ 173.746189] rtnetlink_rcv_msg+0x128/0x390

[ 173.750298] netlink_rcv_skb+0x60/0x130

[ 173.754145] rtnetlink_rcv+0x18/0x24

[ 173.757731] netlink_unicast+0x318/0x380

[ 173.761665] netlink_sendmsg+0x17c/0x3c8