crypto: qat - protect service table iterations with service_lock

Overview

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

crypto: qat - protect service table iterations with service_lock

The service_table list is protected by service_lock when entries are added or removed (in adf_service_add() and adf_service_remove()), but several functions iterate over the list without holding this lock.

A concurrent adf_service_register() or adf_service_unregister() call could modify the list during traversal, leading to list corruption or a use-after-free.

Fix this by holding service_lock across all list_for_each_entry() iterations of service_table in adf_dev_init(), adf_dev_start(), adf_dev_stop(), adf_dev_shutdown(), adf_dev_restarting_notify(), adf_dev_restarted_notify(), and adf_error_notifier().

The lock ordering is safe: callers of the static helpers (adf_dev_up() and adf_dev_down()) acquire state_lock before service_lock, and no event_hld callback or service_lock holder ever acquires state_lock in the reverse order.

Affected

• Linux >= d8cba25d2c68992a6e7c1d329b690a9ebe01167d < 11d48f777cf8fad00db044f4c15cdf821427746b
• Linux >= d8cba25d2c68992a6e7c1d329b690a9ebe01167d < 222fa7b453b612f4407f260146d89a2ce2bc831d
• Linux >= d8cba25d2c68992a6e7c1d329b690a9ebe01167d < c3c5925791cff3b84d313293fd60f384d877d793
• Linux >= d8cba25d2c68992a6e7c1d329b690a9ebe01167d < 0dbcecea740d943002c1cbdafa39bdfc108e32a5
• Linux >= d8cba25d2c68992a6e7c1d329b690a9ebe01167d < 5c6f845e77ec35f9b7b047cc8f9789bf397cdd3e
• Linux 3.17

Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.