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author | Lin Ma <linma@zju.edu.cn> | 2021-04-12 19:17:57 +0800 |
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committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2021-04-23 13:25:04 +0200 |
commit | e2cb6b891ad2b8caa9131e3be70f45243df82a80 (patch) | |
tree | d90080640acfe6a6b6885e96b171154b77cbabf5 /drivers/misc | |
parent | 9204ff94868496f2d9b8b173af52ec455160c364 (diff) | |
download | linux-e2cb6b891ad2b8caa9131e3be70f45243df82a80.tar.bz2 |
bluetooth: eliminate the potential race condition when removing the HCI controller
There is a possible race condition vulnerability between issuing a HCI
command and removing the cont. Specifically, functions hci_req_sync()
and hci_dev_do_close() can race each other like below:
thread-A in hci_req_sync() | thread-B in hci_dev_do_close()
| hci_req_sync_lock(hdev);
test_bit(HCI_UP, &hdev->flags); |
... | test_and_clear_bit(HCI_UP, &hdev->flags)
hci_req_sync_lock(hdev); |
|
In this commit we alter the sequence in function hci_req_sync(). Hence,
the thread-A cannot issue th.
Signed-off-by: Lin Ma <linma@zju.edu.cn>
Cc: Marcel Holtmann <marcel@holtmann.org>
Fixes: 7c6a329e4447 ("[Bluetooth] Fix regression from using default link policy")
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/misc')
0 files changed, 0 insertions, 0 deletions