Bug 2396376 (CVE-2023-53393)

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

RDMA/mlx5: Fix mlx5_ib_get_hw_stats when used for device

Currently, when mlx5_ib_get_hw_stats() is used for device (port_num = 0),
there is a special handling in order to use the correct counters, but,
port_num is being passed down the stack without any change.  Also, some
functions assume that port_num >=1. As a result, the following oops can
occur.

 BUG: unable to handle page fault for address: ffff89510294f1a8
 #PF: supervisor write access in kernel mode
 #PF: error_code(0x0002) - not-present page
 PGD 0 P4D 0
 Oops: 0002 [#1] SMP
 CPU: 8 PID: 1382 Comm: devlink Tainted: G W          6.1.0-rc4_for_upstream_base_2022_11_10_16_12 #1
 Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS rel-1.13.0-0-gf21b5a4aeb02-prebuilt.qemu.org 04/01/2014
 RIP: 0010:_raw_spin_lock+0xc/0x20
 Call Trace:
  <TASK>
  mlx5_ib_get_native_port_mdev+0x73/0xe0 [mlx5_ib]
  do_get_hw_stats.constprop.0+0x109/0x160 [mlx5_ib]
  mlx5_ib_get_hw_stats+0xad/0x180 [mlx5_ib]
  ib_setup_device_attrs+0xf0/0x290 [ib_core]
  ib_register_device+0x3bb/0x510 [ib_core]
  ? atomic_notifier_chain_register+0x67/0x80
  __mlx5_ib_add+0x2b/0x80 [mlx5_ib]
  mlx5r_probe+0xb8/0x150 [mlx5_ib]
  ? auxiliary_match_id+0x6a/0x90
  auxiliary_bus_probe+0x3c/0x70
  ? driver_sysfs_add+0x6b/0x90
  really_probe+0xcd/0x380
  __driver_probe_device+0x80/0x170
  driver_probe_device+0x1e/0x90
  __device_attach_driver+0x7d/0x100
  ? driver_allows_async_probing+0x60/0x60
  ? driver_allows_async_probing+0x60/0x60
  bus_for_each_drv+0x7b/0xc0
  __device_attach+0xbc/0x200
  bus_probe_device+0x87/0xa0
  device_add+0x404/0x940
  ? dev_set_name+0x53/0x70
  __auxiliary_device_add+0x43/0x60
  add_adev+0x99/0xe0 [mlx5_core]
  mlx5_attach_device+0xc8/0x120 [mlx5_core]
  mlx5_load_one_devl_locked+0xb2/0xe0 [mlx5_core]
  devlink_reload+0x133/0x250
  devlink_nl_cmd_reload+0x480/0x570
  ? devlink_nl_pre_doit+0x44/0x2b0
  genl_family_rcv_msg_doit.isra.0+0xc2/0x110
  genl_rcv_msg+0x180/0x2b0
  ? devlink_nl_cmd_region_read_dumpit+0x540/0x540
  ? devlink_reload+0x250/0x250
  ? devlink_put+0x50/0x50
  ? genl_family_rcv_msg_doit.isra.0+0x110/0x110
  netlink_rcv_skb+0x54/0x100
  genl_rcv+0x24/0x40
  netlink_unicast+0x1f6/0x2c0
  netlink_sendmsg+0x237/0x490
  sock_sendmsg+0x33/0x40
  __sys_sendto+0x103/0x160
  ? handle_mm_fault+0x10e/0x290
  ? do_user_addr_fault+0x1c0/0x5f0
  __x64_sys_sendto+0x25/0x30
  do_syscall_64+0x3d/0x90
  entry_SYSCALL_64_after_hwframe+0x46/0xb0

Fix it by setting port_num to 1 in order to get device status and remove
unused variable.