A kernel crash will happen when use tool btattach for a BT controller
with soc type QCA_ROME, and it is caused by dereferencing nullptr
hu->serdev, fixed by null check before access.
sudo btattach -B /dev/ttyUSB0 -P qca
Bluetooth: hci1: QCA setup on UART is completed
BUG: kernel NULL pointer dereference, address: 00000000000002f0
......
Workqueue: hci1 hci_power_on [bluetooth]
RIP: 0010:qca_setup+0x7c1/0xe30 [hci_uart]
......
Call Trace:
<TASK>
? show_regs+0x72/0x90
? __die+0x25/0x80
? page_fault_oops+0x154/0x4c0
? srso_alias_return_thunk+0x5/0xfbef5
? kmem_cache_alloc+0x16b/0x310
? do_user_addr_fault+0x330/0x6e0
? srso_alias_return_thunk+0x5/0xfbef5
? exc_page_fault+0x84/0x1b0
? asm_exc_page_fault+0x27/0x30
? qca_setup+0x7c1/0xe30 [hci_uart]
hci_uart_setup+0x5c/0x1a0 [hci_uart]
hci_dev_open_sync+0xee/0xca0 [bluetooth]
hci_dev_do_open+0x2a/0x70 [bluetooth]
hci_power_on+0x46/0x210 [bluetooth]
process_one_work+0x17b/0x360
worker_thread+0x307/0x430
? __pfx_worker_thread+0x10/0x10
kthread+0xf7/0x130
? __pfx_kthread+0x10/0x10
ret_from_fork+0x46/0x70
? __pfx_kthread+0x10/0x10
ret_from_fork_asm+0x1b/0x30
</TASK>
Fixes: 03b0093f7b31 ("Bluetooth: hci_qca: get wakeup status from serdev device handle")
Signed-off-by: Zijun Hu <quic_zijuhu@xxxxxxxxxxx>
Tested-by: Zijun Hu <quic_zijuhu@xxxxxxxxxxx>
---
drivers/bluetooth/hci_qca.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/drivers/bluetooth/hci_qca.c b/drivers/bluetooth/hci_qca.c
index ecbc52eaf101..158567774cec 100644
--- a/drivers/bluetooth/hci_qca.c
+++ b/drivers/bluetooth/hci_qca.c
@@ -1957,7 +1957,7 @@ static int qca_setup(struct hci_uart *hu)
qca_debugfs_init(hdev);
hu->hdev->hw_error = qca_hw_error;
hu->hdev->cmd_timeout = qca_cmd_timeout;
- if (device_can_wakeup(hu->serdev->ctrl->dev.parent))
+ if (hu->serdev && device_can_wakeup(hu->serdev->ctrl->dev.parent))
hu->hdev->wakeup = qca_wakeup;
} else if (ret == -ENOENT) {
/* No patch/nvm-config found, run with original fw/config */
--
2.7.4
