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From: Zijun Hu <quic_zijuhu@quicinc.com>
To: <luiz.dentz@gmail.com>, <marcel@holtmann.org>
CC: <quic_zijuhu@quicinc.com>, <linux-bluetooth@vger.kernel.org>,
        <johan+linaro@kernel.org>
Subject: [PATCH] Bluetooth: qca: Fix nullptr dereference for non-serdev devices
Date: Wed, 17 Apr 2024 11:49:52 +0800
Message-ID: <1713325792-17181-1-git-send-email-quic_zijuhu@quicinc.com>
Precedence: bulk
MIME-Version: 1.0
Content-Type: text/plain

hu->serdev is nullptr and will cause nullptr dereference if qca_setup()
is called by non-serdev device, fixed by null check before access.

Fixes: 77f45cca8bc5 ("Bluetooth: qca: fix device-address endianness")
Signed-off-by: Zijun Hu <quic_zijuhu@quicinc.com>
---
 drivers/bluetooth/hci_qca.c | 9 +++++----
 1 file changed, 5 insertions(+), 4 deletions(-)

diff --git a/drivers/bluetooth/hci_qca.c b/drivers/bluetooth/hci_qca.c
index 92fa20f5ac7d..9c6573c727e1 100644
--- a/drivers/bluetooth/hci_qca.c
+++ b/drivers/bluetooth/hci_qca.c
@@ -1905,10 +1905,11 @@ static int qca_setup(struct hci_uart *hu)
 	case QCA_WCN6750:
 	case QCA_WCN6855:
 	case QCA_WCN7850:
-		qcadev = serdev_device_get_drvdata(hu->serdev);
-		if (qcadev->bdaddr_property_broken)
-			set_bit(HCI_QUIRK_BDADDR_PROPERTY_BROKEN, &hdev->quirks);
-
+		if (hu->serdev) {
+			qcadev = serdev_device_get_drvdata(hu->serdev);
+			if (qcadev->bdaddr_property_broken)
+				set_bit(HCI_QUIRK_BDADDR_PROPERTY_BROKEN, &hdev->quirks);
+		}
 		hci_set_aosp_capable(hdev);
 
 		ret = qca_read_soc_version(hdev, &ver, soc_type);
-- 
2.7.4