linux-kernel - [PATCH 3/3] Bluetooth: hci_qca: fix a NULL-pointer derefence at shutdown

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Message-Id: <20240731-hci_qca_fixes-v1-3-59dad830b243@linaro.org>
Date: Wed, 31 Jul 2024 17:20:50 +0200
From: Bartosz Golaszewski <brgl@...ev.pl>
To: Marcel Holtmann <marcel@...tmann.org>, 
 Luiz Augusto von Dentz <luiz.dentz@...il.com>, 
 Wren Turkal <wt@...guintechs.org>, 
 Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
Cc: Luiz Augusto von Dentz <luiz.von.dentz@...el.com>, 
 linux-bluetooth@...r.kernel.org, linux-kernel@...r.kernel.org, 
 Bartosz Golaszewski <bartosz.golaszewski@...aro.org>
Subject: [PATCH 3/3] Bluetooth: hci_qca: fix a NULL-pointer derefence at
 shutdown

From: Bartosz Golaszewski <bartosz.golaszewski@...aro.org>

Unlike qca_regulator_init(), qca_power_shutdown() may be called for
QCA_ROME which does not have qcadev->bt_power assigned. Add a
NULL-pointer check before dereferencing the struct qca_power pointer.

Fixes: eba1718717b0 ("Bluetooth: hci_qca: make pwrseq calls the default if available")
Reported-by: Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
Closes: https://lore.kernel.org/linux-bluetooth/su3wp6s44hrxf4ijvsdfzbvv4unu4ycb7kkvwbx6ltdafkldir@4g7ydqm2ap5j/
Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@...aro.org>
---
 drivers/bluetooth/hci_qca.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/bluetooth/hci_qca.c b/drivers/bluetooth/hci_qca.c
index 2baed7d0f479..45adc1560d94 100644
--- a/drivers/bluetooth/hci_qca.c
+++ b/drivers/bluetooth/hci_qca.c
@@ -2160,7 +2160,7 @@ static void qca_power_shutdown(struct hci_uart *hu)
 	qcadev = serdev_device_get_drvdata(hu->serdev);
 	power = qcadev->bt_power;
 
-	if (power->pwrseq) {
+	if (power && power->pwrseq) {
 		pwrseq_power_off(power->pwrseq);
 		set_bit(QCA_BT_OFF, &qca->flags);
 		return;

-- 
2.43.0