Description (CNA)
In the Linux kernel, the following vulnerability has been resolved: OPP: Fix race between OPP addition and lookup A race exists between dev_pm_opp_add_dynamic() and dev_pm_opp_find_freq_exact(): CPU0 (add) CPU1 (lookup) ------------------------------- ------------------------------ _opp_add() mutex_lock() list_add(&new_opp->node, head) mutex_unlock() _opp_table_find_key() mutex_lock() dev_pm_opp_get(opp) kref_get() mutex_unlock() kref_init(&new_opp->kref) dev_pm_opp_put() kref_put_mutex() The newly added OPP is inserted into the list before its kref is initialized. A concurrent lookup can find this OPP and increment its reference count while it is still uninitialized, leading to refcount corruption and a potential premature free. Fix this by initializing ->kref and ->opp_table before making the OPP visible via list_add(). This ensures any concurrent lookup observes a fully initialized object. [ Viresh: Updated commit log ]
Affected (CNA)
| Vendor / product | Versions |
|---|---|
| Linux / Linux | affected 7034764a1e4a6edbb60914e89aad8384e3fe5d17 before 932ebfad767be1395946cbc1727a7c38eeee3d24; affected 7034764a1e4a6edbb60914e89aad8384e3fe5d17 before 1946ea2f6b3ec00e313c78e83fc196f1f6aba2a9; affected 7034764a1e4a6edbb60914e89aad8384e3fe5d17 before 46696b0b2123475d7f95909435c09808fc5ffd23; affected 7034764a1e4a6edbb60914e89aad8384e3fe5d17 before bb75bd7d9ae7672034f73ce67a57e6ac89bb39e5; affected 7034764a1e4a6edbb60914e89aad8384e3fe5d17 before f5e1cc9a284bff2510981643a5bca4bc4c21b81a |
| Linux / Linux | affected 4.11; unaffected 0 before 4.11; unaffected 6.6.160 through 6.6.*; unaffected 6.12.114 through 6.12.*; unaffected 6.18.40 through 6.18.*; unaffected 7.1.5 through 7.1.*; unaffected 7.2 through * |
CWE
No CWE identifiers supplied.
References
- https://git.kernel.org/stable/c/932ebfad767be1395946cbc1727a7c38eeee3d24
- https://git.kernel.org/stable/c/1946ea2f6b3ec00e313c78e83fc196f1f6aba2a9
- https://git.kernel.org/stable/c/46696b0b2123475d7f95909435c09808fc5ffd23
- https://git.kernel.org/stable/c/bb75bd7d9ae7672034f73ce67a57e6ac89bb39e5
- https://git.kernel.org/stable/c/f5e1cc9a284bff2510981643a5bca4bc4c21b81a
ADP enrichment
No English description supplied.
No references supplied.