net: mana: Fix double destroy_workqueue on service rescan PCI path

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

net: mana: Fix double destroy_workqueue on service rescan PCI path

While testing corner cases in the driver, a use-after-free crash

was found on the service rescan PCI path.

When mana_serv_reset() calls mana_gd_suspend(), mana_gd_cleanup()

destroys gc->service_wq. If the subsequent mana_gd_resume() fails

with -ETIMEDOUT or -EPROTO, the code falls through to

mana_serv_rescan() which triggers pci_stop_and_remove_bus_device().

This invokes the PCI .remove callback (mana_gd_remove), which calls

mana_gd_cleanup() a second time, attempting to destroy the already-

freed workqueue. Fix this by NULL-checking gc->service_wq in

mana_gd_cleanup() and setting it to NULL after destruction.

Call stack of issue for reference:

[Sat Feb 21 18:53:48 2026] Call Trace:

[Sat Feb 21 18:53:48 2026] <TASK>

[Sat Feb 21 18:53:48 2026] mana_gd_cleanup+0x33/0x70 [mana]

[Sat Feb 21 18:53:48 2026] mana_gd_remove+0x3a/0xc0 [mana]

[Sat Feb 21 18:53:48 2026] pci_device_remove+0x41/0xb0

[Sat Feb 21 18:53:48 2026] device_remove+0x46/0x70

[Sat Feb 21 18:53:48 2026] device_release_driver_internal+0x1e3/0x250

[Sat Feb 21 18:53:48 2026] device_release_driver+0x12/0x20

[Sat Feb 21 18:53:48 2026] pci_stop_bus_device+0x6a/0x90

[Sat Feb 21 18:53:48 2026] pci_stop_and_remove_bus_device+0x13/0x30

[Sat Feb 21 18:53:48 2026] mana_do_service+0x180/0x290 [mana]

[Sat Feb 21 18:53:48 2026] mana_serv_func+0x24/0x50 [mana]

[Sat Feb 21 18:53:48 2026] process_one_work+0x190/0x3d0

[Sat Feb 21 18:53:48 2026] worker_thread+0x16e/0x2e0

[Sat Feb 21 18:53:48 2026] kthread+0xf7/0x130

[Sat Feb 21 18:53:48 2026] ? __pfx_worker_thread+0x10/0x10

[Sat Feb 21 18:53:48 2026] ? __pfx_kthread+0x10/0x10

[Sat Feb 21 18:53:48 2026] ret_from_fork+0x269/0x350

[Sat Feb 21 18:53:48 2026] ? __pfx_kthread+0x10/0x10

[Sat Feb 21 18:53:48 2026] ret_from_fork_asm+0x1a/0x30

[Sat Feb 21 18:53:48 2026] </TASK>