linux-kernel - [PATCH] gpio: nomadik: remove BUG_ON() in nmk_gpio_populate

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Date: Mon, 11 Mar 2024 14:00:53 +0300
From: Dan Carpenter <dan.carpenter@...aro.org>
To: Linus Walleij <linus.walleij@...aro.org>
Cc: Bartosz Golaszewski <brgl@...ev.pl>,
	linux-arm-kernel@...ts.infradead.org, linux-gpio@...r.kernel.org,
	linux-kernel@...r.kernel.org, kernel-janitors@...r.kernel.org
Subject: [PATCH] gpio: nomadik: remove BUG_ON() in nmk_gpio_populate_chip()

Using BUG_ON() is discouraged and also the check wasn't done early
enough to prevent an out of bounds access.  Check earlier and return
an error instead of calling BUG().

Signed-off-by: Dan Carpenter <dan.carpenter@...aro.org>
---
 drivers/gpio/gpio-nomadik.c | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/drivers/gpio/gpio-nomadik.c b/drivers/gpio/gpio-nomadik.c
index 463a765620dc..5e2f9b51ece3 100644
--- a/drivers/gpio/gpio-nomadik.c
+++ b/drivers/gpio/gpio-nomadik.c
@@ -533,6 +533,11 @@ struct nmk_gpio_chip *nmk_gpio_populate_chip(struct fwnode_handle *fwnode,
 	}
 
 #ifdef CONFIG_PINCTRL_NOMADIK
+	if (id >= ARRAY_SIZE(nmk_gpio_chips)) {
+		dev_err(dev, "populate: invalid id: %u\n", id);
+		platform_device_put(gpio_pdev);
+		return ERR_PTR(-EINVAL);
+	}
 	/* Already populated? */
 	nmk_chip = nmk_gpio_chips[id];
 	if (nmk_chip) {
@@ -606,7 +611,6 @@ struct nmk_gpio_chip *nmk_gpio_populate_chip(struct fwnode_handle *fwnode,
 	}
 
 #ifdef CONFIG_PINCTRL_NOMADIK
-	BUG_ON(nmk_chip->bank >= ARRAY_SIZE(nmk_gpio_chips));
 	nmk_gpio_chips[id] = nmk_chip;
 #endif
 	return nmk_chip;
-- 
2.43.0