From: Max Chou <max.chou@realtek.com>
Date: Tue, 21 Mar 2023 11:48:26 +0000 (+0800)
Subject: Bluetooth: btrtl: check for NULL in btrtl_set_quirks()
X-Git-Tag: v6.1.37~1069
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=ea160ece08668a30ce69f92cc08e87da54a64a9c;p=platform%2Fkernel%2Flinux-starfive.git

Bluetooth: btrtl: check for NULL in btrtl_set_quirks()

[ 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@realtek.com>
Signed-off-by: Luiz Augusto von Dentz <luiz.von.dentz@intel.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---

diff --git a/drivers/bluetooth/btrtl.c b/drivers/bluetooth/btrtl.c
index 6b3755345427..88f8c604d70a 100644
--- a/drivers/bluetooth/btrtl.c
+++ b/drivers/bluetooth/btrtl.c
@@ -882,6 +882,9 @@ 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,