linux-kernel - [PATCH] regulator: rt4801: Fix NULL pointer dereference if priv->enable

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Message-Id: <20210603094944.1114156-1-axel.lin@ingics.com>
Date:   Thu,  3 Jun 2021 17:49:44 +0800
From:   Axel Lin <axel.lin@...ics.com>
To:     Mark Brown <broonie@...nel.org>
Cc:     ChiYuan Huang <cy_huang@...htek.com>,
        Liam Girdwood <lgirdwood@...il.com>,
        linux-kernel@...r.kernel.org, Axel Lin <axel.lin@...ics.com>
Subject: [PATCH] regulator: rt4801: Fix NULL pointer dereference if priv->enable_gpios is NULL

devm_gpiod_get_array_optional may return NULL if no GPIO was assigned.

Signed-off-by: Axel Lin <axel.lin@...ics.com>
---
 drivers/regulator/rt4801-regulator.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/regulator/rt4801-regulator.c b/drivers/regulator/rt4801-regulator.c
index 2055a9cb13ba..7a87788d3f09 100644
--- a/drivers/regulator/rt4801-regulator.c
+++ b/drivers/regulator/rt4801-regulator.c
@@ -66,7 +66,7 @@ static int rt4801_enable(struct regulator_dev *rdev)
 	struct gpio_descs *gpios = priv->enable_gpios;
 	int id = rdev_get_id(rdev), ret;
 
-	if (gpios->ndescs <= id) {
+	if (!gpios || gpios->ndescs <= id) {
 		dev_warn(&rdev->dev, "no dedicated gpio can control\n");
 		goto bypass_gpio;
 	}
@@ -88,7 +88,7 @@ static int rt4801_disable(struct regulator_dev *rdev)
 	struct gpio_descs *gpios = priv->enable_gpios;
 	int id = rdev_get_id(rdev);
 
-	if (gpios->ndescs <= id) {
+	if (!gpios || gpios->ndescs <= id) {
 		dev_warn(&rdev->dev, "no dedicated gpio can control\n");
 		goto bypass_gpio;
 	}
-- 
2.25.1