net/mlx5: Fix ECVF vports unload on shutdown flow

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

net/mlx5: Fix ECVF vports unload on shutdown flow

Fix shutdown flow UAF when a virtual function is created on the embedded

chip (ECVF) of a BlueField device. In such case the vport acl ingress

table is not properly destroyed.

ECVF functionality is independent of ecpf_vport_exists capability and

thus functions mlx5_eswitch_(enable|disable)_pf_vf_vports() should not

test it when enabling/disabling ECVF vports.

kernel log:

[] refcount_t: underflow; use-after-free.

[] WARNING: CPU: 3 PID: 1 at lib/refcount.c:28

refcount_warn_saturate+0x124/0x220

----------------

[] Call trace:

[] refcount_warn_saturate+0x124/0x220

[] tree_put_node+0x164/0x1e0 [mlx5_core]

[] mlx5_destroy_flow_table+0x98/0x2c0 [mlx5_core]

[] esw_acl_ingress_table_destroy+0x28/0x40 [mlx5_core]

[] esw_acl_ingress_lgcy_cleanup+0x80/0xf4 [mlx5_core]

[] esw_legacy_vport_acl_cleanup+0x44/0x60 [mlx5_core]

[] esw_vport_cleanup+0x64/0x90 [mlx5_core]

[] mlx5_esw_vport_disable+0xc0/0x1d0 [mlx5_core]

[] mlx5_eswitch_unload_ec_vf_vports+0xcc/0x150 [mlx5_core]

[] mlx5_eswitch_disable_sriov+0x198/0x2a0 [mlx5_core]

[] mlx5_device_disable_sriov+0xb8/0x1e0 [mlx5_core]

[] mlx5_sriov_detach+0x40/0x50 [mlx5_core]

[] mlx5_unload+0x40/0xc4 [mlx5_core]

[] mlx5_unload_one_devl_locked+0x6c/0xe4 [mlx5_core]

[] mlx5_unload_one+0x3c/0x60 [mlx5_core]

[] shutdown+0x7c/0xa4 [mlx5_core]

[] pci_device_shutdown+0x3c/0xa0

[] device_shutdown+0x170/0x340

[] __do_sys_reboot+0x1f4/0x2a0

[] __arm64_sys_reboot+0x2c/0x40

[] invoke_syscall+0x78/0x100

[] el0_svc_common.constprop.0+0x54/0x184

[] do_el0_svc+0x30/0xac

[] el0_svc+0x48/0x160

[] el0t_64_sync_handler+0xa4/0x12c

[] el0t_64_sync+0x1a4/0x1a8

[] --[ end trace 9c4601d68c70030e ]---