CVE-2024-26587

In the Linux kernel, the following vulnerability has been resolved: net:
netdevsim: don’t try to destroy PHC on VFs PHC gets initialized in
nsim_init_netdevsim(), which is only called if (nsim_dev_port_is_pf()).
Create a counterpart of nsim_init_netdevsim() and move the
mock_phc_destroy() there. This fixes a crash trying to destroy netdevsim
with VFs instantiated, as caught by running the devlink.sh test: BUG:
kernel NULL pointer dereference, address: 00000000000000b8 RIP:
0010:mock_phc_destroy+0xd/0x30 Call Trace: <TASK> nsim_destroy+0x4a/0x70
[netdevsim] __nsim_dev_port_del+0x47/0x70 [netdevsim]
nsim_dev_reload_destroy+0x105/0x120 [netdevsim] nsim_drv_remove+0x2f/0xb0
[netdevsim] device_release_driver_internal+0x1a1/0x210
bus_remove_device+0xd5/0x120 device_del+0x159/0x490
device_unregister+0x12/0x30 del_device_store+0x11a/0x1a0 [netdevsim]
kernfs_fop_write_iter+0x130/0x1d0 vfs_write+0x30b/0x4b0
ksys_write+0x69/0xf0 do_syscall_64+0xcc/0x1e0
entry_SYSCALL_64_after_hwframe+0x6f/0x77