[cip-dev] [PATCH 4.4.y-cip] gpio: rcar: Avoid NULL pointer access in gpio_rcar_set_multiple()

From: "Lad Prabhakar" <prabhakar.mahadev-lad.rj@bp.renesas.com>
To: cip-dev@lists.cip-project.org,
	Nobuhiro Iwamatsu <nobuhiro1.iwamatsu@toshiba.co.jp>,
	Pavel Machek <pavel@denx.de>
Cc: Biju Das <biju.das.jz@bp.renesas.com>
Subject: [cip-dev] [PATCH 4.4.y-cip] gpio: rcar: Avoid NULL pointer access in gpio_rcar_set_multiple()
Date: Fri,  4 Sep 2020 08:40:57 +0100	[thread overview]
Message-ID: <20200904074057.27932-1-prabhakar.mahadev-lad.rj@bp.renesas.com> (raw)

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gpiochip_get_data() expects the controller probe to call
gpiochip_add_data() before using it, where as the rcar-gpio
driver probe has gpiochip_add() call thus resulting in NULL
pointer access.

Avoid this case by using gpio_to_priv() call.

Fixes: 6e52cced1aa58 ("gpio: rcar: Implement gpiochip.set_multiple()")
Signed-off-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@bp.renesas.com>
---
 drivers/gpio/gpio-rcar.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/gpio/gpio-rcar.c b/drivers/gpio/gpio-rcar.c
index e829f11aca8f..2778dcd96ae7 100644
--- a/drivers/gpio/gpio-rcar.c
+++ b/drivers/gpio/gpio-rcar.c
@@ -352,7 +352,7 @@ static void gpio_rcar_set(struct gpio_chip *chip, unsigned offset, int value)
 static void gpio_rcar_set_multiple(struct gpio_chip *chip, unsigned long *mask,
 				   unsigned long *bits)
 {
-	struct gpio_rcar_priv *p = gpiochip_get_data(chip);
+	struct gpio_rcar_priv *p = gpio_to_priv(chip);
 	unsigned long flags;
 	u32 val, bankmask;
 
-- 
2.17.1


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