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@ingics.com>
Link: https://lore.kernel.org/r/20210603094944.1114156-1-axel.lin@ingics.com
Signed-off-by: Mark Brown <broonie@kernel.org>

diff --git a/drivers/regulator/rt4801-regulator.c b/drivers/regulator/rt4801-regulator.c
index 2055a9c..7a87788 100644 (file)
--- 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;
        }