[v4,1/5] Bluetooth: btmtksdio: Fix kernel oops in btmtksdio_interrupt

Commit Message

Sean Wang March 15, 2022, 5:54 p.m. UTC

From: Yake Yang <[e-mail]>

Fix the following kernel oops in btmtksdio_interrrupt

[   14.339134]  btmtksdio_interrupt+0x28/0x54
[   14.339139]  process_sdio_pending_irqs+0x68/0x1a0
[   14.339144]  sdio_irq_work+0x40/0x70
[   14.339154]  process_one_work+0x184/0x39c
[   14.339160]  worker_thread+0x228/0x3e8
[   14.339168]  kthread+0x148/0x3ac
[   14.339176]  ret_from_fork+0x10/0x30

That happened because hdev->power_on is already called before
sdio_set_drvdata which btmtksdio_interrupt handler relies on is not
properly set up.

The details are shown as the below: hci_register_dev would run
queue_work(hdev->req_workqueue, &hdev->power_on) as WQ_HIGHPRI
workqueue_struct to complete the power-on sequeunce and thus hci_power_on
may run before sdio_set_drvdata is done in btmtksdio_probe.

The hci_dev_do_open in hci_power_on would initialize the device and enable
the interrupt and thus it is possible that btmtksdio_interrupt is being
called right before sdio_set_drvdata is filled out.

When btmtksdio_interrupt is being called and sdio_set_drvdata is not filled
, the kernel oops is going to happen because btmtksdio_interrupt access an
uninitialized pointer.

Fixes: 9aebfd4a2200 ("Bluetooth: mediatek: add support for MediaTek MT7663S and MT7668S SDIO devices")
Reviewed-by: Mark Chen <[e-mail]>
Co-developed-by: Sean Wang <[e-mail]>
Signed-off-by: Sean Wang <[e-mail]>
Signed-off-by: Yake Yang <[e-mail]>
---
 drivers/bluetooth/btmtksdio.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

Comments

[e-mail] March 15, 2022, 7:05 p.m. UTC | #1

This is automated email and please do not reply to this email!

Dear submitter,

Thank you for submitting the patches to the linux bluetooth mailing list.
This is a CI test results with your patch series:
PW Link:https://patchwork.kernel.org/project/bluetooth/list/?series=623608

---Test result---

Test Summary:
CheckPatch                    PASS      8.07 seconds
GitLint                       PASS      4.89 seconds
SubjectPrefix                 PASS      4.40 seconds
BuildKernel                   PASS      30.43 seconds
BuildKernel32                 PASS      27.61 seconds
Incremental Build with patchesPASS      61.38 seconds
TestRunner: Setup             PASS      476.36 seconds
TestRunner: l2cap-tester      PASS      15.66 seconds
TestRunner: bnep-tester       PASS      6.08 seconds
TestRunner: mgmt-tester       PASS      122.73 seconds
TestRunner: rfcomm-tester     PASS      7.75 seconds
TestRunner: sco-tester        PASS      7.91 seconds
TestRunner: smp-tester        PASS      7.61 seconds
TestRunner: userchan-tester   PASS      6.46 seconds



---
Regards,
Linux Bluetooth

Patch

diff --git a/drivers/bluetooth/btmtksdio.c b/drivers/bluetooth/btmtksdio.c
index df3f9d090529..9644069cecbb 100644
--- a/drivers/bluetooth/btmtksdio.c
+++ b/drivers/bluetooth/btmtksdio.c
@@ -1281,6 +1281,8 @@  static int btmtksdio_probe(struct sdio_func *func,
 	hdev->manufacturer = 70;
 	set_bit(HCI_QUIRK_NON_PERSISTENT_SETUP, &hdev->quirks);
 
+	sdio_set_drvdata(func, bdev);
+
 	err = hci_register_dev(hdev);
 	if (err < 0) {
 		dev_err(&func->dev, "Can't register HCI device\n");
@@ -1288,8 +1290,6 @@  static int btmtksdio_probe(struct sdio_func *func,
 		return err;
 	}
 
-	sdio_set_drvdata(func, bdev);
-
 	/* pm_runtime_enable would be done after the firmware is being
 	 * downloaded because the core layer probably already enables
 	 * runtime PM for this func such as the case host->caps &