CVE-2024-41063

In the Linux kernel, the following vulnerability has been resolved:<br /> <br /> Bluetooth: hci_core: cancel all works upon hci_unregister_dev()<br /> <br /> syzbot is reporting that calling hci_release_dev() from hci_error_reset()<br /> due to hci_dev_put() from hci_error_reset() can cause deadlock at<br /> destroy_workqueue(), for hci_error_reset() is called from<br /> hdev-&gt;req_workqueue which destroy_workqueue() needs to flush.<br /> <br /> We need to make sure that hdev-&gt;{rx_work,cmd_work,tx_work} which are<br /> queued into hdev-&gt;workqueue and hdev-&gt;{power_on,error_reset} which are<br /> queued into hdev-&gt;req_workqueue are no longer running by the moment<br /> <br /> destroy_workqueue(hdev-&gt;workqueue);<br /> destroy_workqueue(hdev-&gt;req_workqueue);<br /> <br /> are called from hci_release_dev().<br /> <br /> Call cancel_work_sync() on these work items from hci_unregister_dev()<br /> as soon as hdev-&gt;list is removed from hci_dev_list.