CVE-2025-22014 Information

Description

In the Linux kernel the following vulnerability has been resolved:

soc: qcom: pdr: Fix the potential deadlock

When some client process A call pdr_add_lookup() to add the look up for the service and does schedule locator work later a process B got a new server packet indicating locator is up and call pdr_locator_new_server() which eventually sets pdr->locator_init_complete to true which process A sees and takes list lock and queries domain list but it will timeout due to deadlock as the response will queued to the same qmi->wq and it is ordered workqueue and process B is not able to complete new server request work due to deadlock on list lock.

Fix it by removing the unnecessary list iteration as the list iteration is already being done inside locator work so avoid it here and just call schedule_work() here.

   Process A                        Process B

                                 process_scheduled_works()

pdr_add_lookup() qmi_data_ready_work() process_scheduled_works() pdr_locator_new_server() pdr->locator_init_complete=true; pdr_locator_work() mutex_lock(&pdr->list_lock);

 pdr_locate_service()                  mutex_lock(&pdr->list_lock);

  pdr_get_domain_list()
   pr_err(\PDR: %s get domain list
           txn wait failed: %d\n\n               req->service_name
           ret);

Timeout error log due to deadlock:

\n PDR: tms/servreg get domain list txn wait failed: -110 PDR: service lookup for msm/adsp/sensor_pd:tms/servreg failed: -110 \n Thanks to Bjorn and Johan for letting me know that this commit also fixes an audio regression when using the in-kernel pd-mapper as that makes it easier to hit this race. [1]

Reference

https://git.kernel.org/stable/c/02612f1e4c34d94d6c8ee75bf7d254ed697e22d4 https://git.kernel.org/stable/c/0a566a79aca9851fae140536e0fc5b0853c90a90 https://git.kernel.org/stable/c/2eeb03ad9f42dfece63051be2400af487ddb96d2 https://git.kernel.org/stable/c/f2bbfd50e95bc117360f0f59e629aa03d821ebd6 https://git.kernel.org/stable/c/f4489260f5713c94e1966e5f20445bff262876f4