linux-kernel - [PATCH AUTOSEL 6.2 48/53] Bluetooth: btrtl: check for NULL in btrtl_set

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Message-Id: <20230504194413.3806354-48-sashal@kernel.org>
Date:   Thu,  4 May 2023 15:44:08 -0400
From:   Sasha Levin <sashal@...nel.org>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:     Max Chou <max.chou@...ltek.com>,
        Luiz Augusto von Dentz <luiz.von.dentz@...el.com>,
        Sasha Levin <sashal@...nel.org>, marcel@...tmann.org,
        johan.hedberg@...il.com, luiz.dentz@...il.com,
        linux-bluetooth@...r.kernel.org
Subject: [PATCH AUTOSEL 6.2 48/53] Bluetooth: btrtl: check for NULL in btrtl_set_quirks()

From: Max Chou <max.chou@...ltek.com>

[ Upstream commit 253cf30e8d3d001850a95c4729d668f916b037ab ]

The btrtl_set_quirks() has accessed btrtl_dev->ic_info->lmp_subver since
b8e482d02513. However, if installing a Realtek Bluetooth controller
without the driver supported, it will hit the NULL point accessed.

Add a check for NULL to avoid the Kernel Oops.

Signed-off-by: Max Chou <max.chou@...ltek.com>
Signed-off-by: Luiz Augusto von Dentz <luiz.von.dentz@...el.com>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/bluetooth/btrtl.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/bluetooth/btrtl.c b/drivers/bluetooth/btrtl.c
index 44b672cca69ee..7061621faeb0c 100644
--- a/drivers/bluetooth/btrtl.c
+++ b/drivers/bluetooth/btrtl.c
@@ -889,6 +889,9 @@ void btrtl_set_quirks(struct hci_dev *hdev, struct btrtl_device_info *btrtl_dev)
 		break;
 	}
 
+	if (!btrtl_dev->ic_info)
+		return;
+
 	switch (btrtl_dev->ic_info->lmp_subver) {
 	case RTL_ROM_LMP_8703B:
 		/* 8723CS reports two pages for local ext features,
-- 
2.39.2