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From: Zijun Hu <quic_zijuhu@quicinc.com>
To: <luiz.dentz@gmail.com>, <luiz.von.dentz@intel.com>, <marcel@holtmann.org>
CC: <linux-bluetooth@vger.kernel.org>, <quic_zijuhu@quicinc.com>
Subject: [PATCH v3 2/4] Bluetooth: qca: Fix nullptr dereference for non-serdev devices
Date: Thu, 18 Apr 2024 11:11:51 +0800
Message-ID: <1713409913-13042-3-git-send-email-quic_zijuhu@quicinc.com>
In-Reply-To: <1713409913-13042-1-git-send-email-quic_zijuhu@quicinc.com>
References: <1713358336-29619-1-git-send-email-quic_zijuhu@quicinc.com>
 <1713409913-13042-1-git-send-email-quic_zijuhu@quicinc.com>
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hu->serdev is nullptr and will cause nullptr dereference if qca_setup()
is called by non-serdev device, fixed by nullptr checking before access.

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 fdaf83d817af..c04b97332bca 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