CVE-2026-68319pds_core: fix deadlock between reset thread and remove

Official description

In the Linux kernel, the following vulnerability has been resolved: pds_core: fix deadlock between reset thread and remove pci_reset_function() acquires device_lock before performing the reset. pdsc_remove() is called by the PCI core with device_lock already held. If pdsc_pci_reset_thread() is running when pdsc_remove() is called, destroy_workqueue() will block waiting for the work to complete, while the work is blocked waiting for device_lock - deadlock. Use pci_try_reset_function() which uses pci_dev_trylock() internally. This acquires both the device lock and the PCI config access lock without blocking - if either lock is contended, it returns -EAGAIN immediately. This avoids the deadlock while also ensuring proper config space access serialization during the reset. The pci_dev_get/put calls are also removed as they were unnecessary - the driver-owned workqueue is destroyed in pdsc_remove(), guaranteeing the work completes before remove returns. The PCI core holds its reference to pci_dev throughout the entire unbind sequence.

Affected packages & fixed versions

Affected products (as reported)

References

• https://git.kernel.org/stable/c/90d9f3ef28843e6c35149324b8eefb427a7435c2
• https://git.kernel.org/stable/c/19ef775c91c6bf4bd2b60f6616f4e28b621cdd6a
• https://git.kernel.org/stable/c/54f905821f26d385fba407a920b51f0a752c76dc
• https://git.kernel.org/stable/c/ab0eec0ff0a421737a37f510ceab5c6ea59cd05a