linux-kernel - [PATCH] Bluetooth: hci_qca: Fix crash with non-serdev devices

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Message-Id: <20190423181653.147804-1-mka@chromium.org>
Date:   Tue, 23 Apr 2019 11:16:52 -0700
From:   Matthias Kaehlcke <mka@...omium.org>
To:     Marcel Holtmann <marcel@...tmann.org>,
        Johan Hedberg <johan.hedberg@...il.com>
Cc:     linux-bluetooth@...r.kernel.org, linux-kernel@...r.kernel.org,
        Balakrishna Godavarthi <bgodavar@...eaurora.org>,
        Hemantg <hemantg@...eaurora.org>,
        Rocky Liao <rjliao@...eaurora.org>,
        Matthias Kaehlcke <mka@...omium.org>
Subject: [PATCH] Bluetooth: hci_qca: Fix crash with non-serdev devices

qca_set_baudrate() calls serdev_device_wait_until_sent() assuming that
the HCI is always associated with a serdev device. This isn't true for
ROME controllers instantiated through ldisc, where the call causes a
crash due to a NULL pointer dereferentiation. Only call the function
when we have a serdev device. The timeout for ROME devices at the end
of qca_set_baudrate() is long enough to be reasonably sure that the
command was sent.

Fixes: fa9ad876b8e0 ("Bluetooth: hci_qca: Add support for Qualcomm Bluetooth chip wcn3990")
Reported-by: Balakrishna Godavarthi <bgodavar@...eaurora.org>
Reported-by: Rocky Liao <rjliao@...eaurora.org>
Signed-off-by: Matthias Kaehlcke <mka@...omium.org>
Reviewed-by: Rocky Liao <rjliao@...eaurora.org>
Tested-by: Rocky Liao <rjliao@...eaurora.org>
Reviewed-by: Balakrishna Godavarthi <bgodavar@...eaurora.org>
---
Changes in v2:
- first version got corrupted for some reason, this should apply
- added 'Reviewed-by' tags from Rocky abd Balakrishna
- added 'Tested-by' tag from Rocky
---
 drivers/bluetooth/hci_qca.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/bluetooth/hci_qca.c b/drivers/bluetooth/hci_qca.c
index a80c3bc90904..7f75652686fe 100644
--- a/drivers/bluetooth/hci_qca.c
+++ b/drivers/bluetooth/hci_qca.c
@@ -1006,7 +1006,8 @@ static int qca_set_baudrate(struct hci_dev *hdev, uint8_t baudrate)
 	while (!skb_queue_empty(&qca->txq))
 		usleep_range(100, 200);
 
-	serdev_device_wait_until_sent(hu->serdev,
+	if (hu->serdev)
+		serdev_device_wait_until_sent(hu->serdev,
 		      msecs_to_jiffies(CMD_TRANS_TIMEOUT_MS));
 
 	/* Give the controller time to process the request */
-- 
2.21.0.593.g511ec345e18-goog