Luiz Augusto von Dentz f32d5615a7 Bluetooth: L2CAP: Fix use-after-free caused by l2cap_chan_put ... commit d0be8347c6 upstream. This fixes the following trace which is caused by hci_rx_work starting up *after* the final channel reference has been put() during sock_close() but *before* the references to the channel have been destroyed, so instead the code now rely on kref_get_unless_zero/l2cap_chan_hold_unless_zero to prevent referencing a channel that is about to be destroyed. refcount_t: increment on 0; use-after-free. BUG: KASAN: use-after-free in refcount_dec_and_test+0x20/0xd0 Read of size 4 at addr ffffffc114f5bf18 by task kworker/u17:14/705 CPU: 4 PID: 705 Comm: kworker/u17:14 Tainted: G S W 4.14.234-00003-g1fb6d0bd49a4-dirty #28 Hardware name: Qualcomm Technologies, Inc. SM8150 V2 PM8150 Google Inc. MSM sm8150 Flame DVT (DT) Workqueue: hci0 hci_rx_work Call trace: dump_backtrace+0x0/0x378 show_stack+0x20/0x2c dump_stack+0x124/0x148 print_address_description+0x80/0x2e8 __kasan_report+0x168/0x188 kasan_report+0x10/0x18 __asan_load4+0x84/0x8c refcount_dec_and_test+0x20/0xd0 l2cap_chan_put+0x48/0x12c l2cap_recv_frame+0x4770/0x6550 l2cap_recv_acldata+0x44c/0x7a4 hci_acldata_packet+0x100/0x188 hci_rx_work+0x178/0x23c process_one_work+0x35c/0x95c worker_thread+0x4cc/0x960 kthread+0x1a8/0x1c4 ret_from_fork+0x10/0x18 Cc: stable@kernel.org Reported-by: Lee Jones <lee.jones@linaro.org> Signed-off-by: Luiz Augusto von Dentz <luiz.von.dentz@intel.com> Tested-by: Lee Jones <lee.jones@linaro.org> Signed-off-by: Luiz Augusto von Dentz <luiz.von.dentz@intel.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>		2022-08-03 12:03:40 +02:00
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bluetooth.h	Bluetooth: Fix bt_skb_sendmmsg not allocating partial chunks	2022-07-29 17:25:30 +02:00
hci.h	Bluetooth: add quirk disabling LE Read Transmit Power	2022-01-16 09:12:44 +01:00
hci_core.h	Bluetooth: Fix the creation of hdev->name	2022-05-15 20:18:52 +02:00
hci_mon.h	Bluetooth: monitor: Add support for ISO packets	2020-01-15 22:28:51 +01:00
hci_sock.h	Bluetooth: Use only 8 bits for the HCI CMSG state flags	2020-06-12 15:10:46 +02:00
l2cap.h	Bluetooth: L2CAP: Fix use-after-free caused by l2cap_chan_put	2022-08-03 12:03:40 +02:00
mgmt.h	Bluetooth: use inclusive language in SMP	2021-06-26 07:12:37 +02:00
rfcomm.h	Bluetooth: Replace zero-length array with flexible-array member	2020-02-28 08:30:02 +01:00
sco.h	Bluetooth: Add support for BT_PKT_STATUS CMSG data for SCO connections	2020-06-12 15:08:49 +02:00