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android_kernel_motorola_sm6225/net/bluetooth
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Lin Ma 35113c4c9f bluetooth: eliminate the potential race condition when removing the HCI controller 
commit e2cb6b891ad2b8caa9131e3be70f45243df82a80 upstream.

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: 7c6a329e44 ("[Bluetooth] Fix regression from using default link policy")
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2021-05-22 10:59:24 +02:00
..
bnep net: remove sock_no_poll 2018-05-26 09:16:44 +02:00
cmtp Merge branch 'work.aio-1' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs 2018-06-04 13:57:43 -07:00
hidp Bluetooth: hidp: fix buffer overflow 2019-05-10 17:54:11 +02:00
rfcomm Bluetooth: RFCOMM: fix ODEBUG bug in rfcomm_dev_ioctl 2020-04-13 10:45:14 +02:00
6lowpan.c Bluetooth: add a mutex lock to avoid UAF in do_enale_set 2020-08-19 08:14:50 +02:00
a2mp.c Bluetooth: drop HCI device reference before return 2021-03-04 09:39:34 +01:00
a2mp.h Bluetooth: Add BT_HS config option 2015-07-30 13:31:59 +02:00
af_bluetooth.c net: use skb_queue_empty_lockless() in poll() handlers 2019-11-10 11:27:48 +01:00
amp.c Bluetooth: Fix null pointer dereference in amp_read_loc_assoc_final_data 2021-03-07 12:18:58 +01:00
amp.h Bluetooth: Add BT_HS config option 2015-07-30 13:31:59 +02:00
ecdh_helper.c Bluetooth: let the crypto subsystem generate the ecc privkey 2017-10-06 20:35:47 +02:00
ecdh_helper.h Fix misc new gcc warnings 2021-05-22 10:59:21 +02:00
hci_conn.c Bluetooth: Disconnect if E0 is used for Level 4 2020-10-17 10:12:57 +02:00
hci_core.c Bluetooth: Put HCI device if inquiry procedure interrupts 2021-03-04 09:39:34 +01:00
hci_debugfs.c Bluetooth: Store Resolv list size 2018-07-06 12:40:08 +02:00
hci_debugfs.h Bluetooth: Provide option to enable/disable debugfs information 2015-02-15 18:54:13 +02:00
hci_event.c Bluetooth: verify AMP hci_chan before amp_destroy 2021-05-22 10:59:23 +02:00
hci_request.c bluetooth: eliminate the potential race condition when removing the HCI controller 2021-05-22 10:59:24 +02:00
hci_request.h Bluetooth: Ignore CC events not matching the last HCI command 2019-05-31 06:46:09 -07:00
hci_sock.c Bluetooth: Fix race condition in hci_release_sock() 2020-02-05 14:43:39 +00:00
hci_sysfs.c Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net 2017-11-04 09:26:51 +09:00
Kconfig Revert "Bluetooth: Add option for disabling legacy ioctl interfaces" 2017-09-28 13:20:32 -07:00
l2cap_core.c Bluetooth: L2CAP: Fix calling sk_filter on non-socket based channel 2020-10-17 10:12:56 +02:00
l2cap_sock.c Bluetooth: Only mark socket zapped after unlocking 2020-10-30 10:38:30 +01:00
leds.c leds: triggers: let struct led_trigger::activate() return an error code 2018-07-05 23:21:10 +02:00
leds.h Bluetooth: Add combined LED trigger for controller power 2016-09-19 20:19:34 +02:00
lib.c Bluetooth: make baswap src const 2017-09-01 22:49:47 +02:00
Makefile License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
mgmt.c Bluetooth: MGMT: Fix not checking if BT_HS is enabled 2020-10-17 10:12:57 +02:00
mgmt_util.c networking: make skb_push & __skb_push return void pointers 2017-06-16 11:48:40 -04:00
mgmt_util.h Bluetooth: Add generic mgmt helper API 2015-03-17 18:03:08 +01:00
sco.c Bluetooth: Fix locking in bt_accept_enqueue() for BH context 2019-03-10 07:17:21 +01:00
selftest.c Bluetooth: Fix compiler warning with selftest duration calculation 2017-10-06 21:49:13 +03:00
selftest.h Bluetooth: Add support for self testing framework 2014-12-30 08:53:55 +02:00
smp.c Bluetooth: Add SMP workaround Microsoft Surface Precision Mouse bug 2019-07-26 09:14:30 +02:00
smp.h Bluetooth: SMP: fix crash in unpairing 2018-09-26 12:39:32 +03:00