[PATCH] gpio: nomadik: remove BUG_ON() in nmk_gpio_populate_chip()

[PATCH] gpio: nomadik: remove BUG_ON() in nmk_gpio_populate_chip()

[Dan Carpenter]

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@linaro.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

Re: [PATCH] gpio: nomadik: remove BUG_ON() in nmk_gpio_populate_chip()

[Linus Walleij]

On Mon, Mar 11, 2024 at 12:00 PM Dan Carpenter <dan.carpenter@linaro.org> wrote:

> 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@linaro.org>

Thanks Dan, I applied the patch to the pin control tree since the
rest of the stuff is resting there and Bartosz already sent his pull
request.

Yours,
Linus Walleij

Re: [PATCH] gpio: nomadik: remove BUG_ON() in nmk_gpio_populate_chip()

[Bartosz Golaszewski]

On Tue, Mar 12, 2024 at 12:52 PM Linus Walleij <linus.walleij@linaro.org> wrote:
>
> On Mon, Mar 11, 2024 at 12:00 PM Dan Carpenter <dan.carpenter@linaro.org> wrote:
>
> > 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@linaro.org>
>
> Thanks Dan, I applied the patch to the pin control tree since the
> rest of the stuff is resting there and Bartosz already sent his pull
> request.
>

Yes I did. There were no conflicts in next with nomadik updates so I
figured you'll just send it yourself. Let me know if you need anything
from my side.

Bart