Description
In the Linux kernel, the following vulnerability has been resolved: Bluetooth: avoid hci_dev_test_and_set_flag() in mgmt_init_hdev() syzbot is again reporting attempt to cancel uninitialized work at mgmt_index_removed() [1], for setting of HCI_MGMT flag from mgmt_init_hdev() from hci_mgmt_cmd() from hci_sock_sendmsg() can race with testing of HCI_MGMT flag from mgmt_index_removed() from hci_sock_bind() due to lack of serialization via hci_dev_lock(). Since mgmt_init_hdev() is called with mgmt_chan_list_lock held, we can safely split hci_dev_test_and_set_flag() into hci_dev_test_flag() and hci_dev_set_flag(). Thus, in order to close this race, set HCI_MGMT flag after INIT_DELAYED_WORK() completed. This is a local fix based on mgmt_chan_list_lock. Lack of serialization via hci_dev_lock() might be causing different race conditions somewhere else. But a global fix based on hci_dev_lock() should deserve a future patch.
Product status
3f2893d3c142986aa935821460cb3adb77044722 (git) before e53c6180db8dd09de94e0a3bdf4fef6f5f9dd6e6
3f2893d3c142986aa935821460cb3adb77044722 (git) before f74ca25d6d6629ffd4fd80a1a73037253b57d06b
6.0
Any version before 6.0
6.0.3 (semver)
6.1 (original_commit_for_fix)
References
git.kernel.org/...c/e53c6180db8dd09de94e0a3bdf4fef6f5f9dd6e6
git.kernel.org/...c/f74ca25d6d6629ffd4fd80a1a73037253b57d06b
