Description (CNA)
In the Linux kernel, the following vulnerability has been resolved: spi: cadence-qspi: remove system-wide suspend helper calls from runtime PM hooks The ->runtime_suspend() and ->runtime_resume() callbacks are not expected to call spi_controller_suspend() and spi_controller_resume(). Remove calls to those in the cadence-qspi driver. Those helpers have two roles currently: - They stop/start the queue, including dealing with the kworker. - They toggle the SPI controller SPI_CONTROLLER_SUSPENDED flag. It requires acquiring ctlr->bus_lock_mutex. Step one is irrelevant because cadence-qspi is not queued. Step two however has two implications: - A deadlock occurs, because ->runtime_resume() is called in a context where the lock is already taken (in the ->exec_op() callback, where the usage count is incremented). - It would disallow all operations once the device is auto-suspended. Here is a brief call tree highlighting the mutex deadlock: spi_mem_exec_op() ... spi_mem_access_start() mutex_lock(&ctlr->bus_lock_mutex) cqspi_exec_mem_op() pm_runtime_resume_and_get() cqspi_resume() spi_controller_resume() mutex_lock(&ctlr->bus_lock_mutex) ... spi_mem_access_end() mutex_unlock(&ctlr->bus_lock_mutex) ...
Affected (CNA)
| Vendor / product | Versions |
|---|---|
| Linux / Linux | affected 0578a6dbfe7514db7134501cf93acc21cf13e479 before 041562ebc4759c9932b59a06527f8753b86da365; affected 0578a6dbfe7514db7134501cf93acc21cf13e479 before 959043afe53ae80633e810416cee6076da6e91c6 |
| Linux / Linux | affected 6.7; unaffected 0 before 6.7; unaffected 6.7.9 through 6.7.*; unaffected 6.8 through * |
CWE
No CWE identifiers supplied.
References
- https://git.kernel.org/stable/c/041562ebc4759c9932b59a06527f8753b86da365
- https://git.kernel.org/stable/c/959043afe53ae80633e810416cee6076da6e91c6
ADP enrichment
No English description supplied.
No references supplied.
No English description supplied.