RDMA/mlx5: Fix mlx5_ib_get_hw_stats when used for device

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.