[PATCH] pinctrl: nuvoton: npcm8xx: Add NULL check in npcm8xx_gpio_fw

[Charles Han <hanchunchao@xxxxxxxxxx>]

devm_kasprintf() calls can return null pointers on failure.
But the return values were not checked in npcm8xx_gpio_fw().
Add NULL check in npcm8xx_gpio_fw(), to handle kernel NULL
pointer dereference error.

Fixes: acf4884a5717 ("pinctrl: nuvoton: add NPCM8XX pinctrl and GPIO driver")
Signed-off-by: Charles Han <hanchunchao@xxxxxxxxxx>
---
 drivers/pinctrl/nuvoton/pinctrl-npcm8xx.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/pinctrl/nuvoton/pinctrl-npcm8xx.c b/drivers/pinctrl/nuvoton/pinctrl-npcm8xx.c
index 70e6966049e4..17825bbe1421 100644
--- a/drivers/pinctrl/nuvoton/pinctrl-npcm8xx.c
+++ b/drivers/pinctrl/nuvoton/pinctrl-npcm8xx.c
@@ -2374,6 +2374,9 @@ static int npcm8xx_gpio_fw(struct npcm8xx_pinctrl *pctrl)
 		pctrl->gpio_bank[id].gc.parent = dev;
 		pctrl->gpio_bank[id].gc.fwnode = child;
 		pctrl->gpio_bank[id].gc.label = devm_kasprintf(dev, GFP_KERNEL, "%pfw", child);
+		if (pctrl->gpio_bank[id].gc.label == NULL)
+			return -ENOMEM;
+
 		pctrl->gpio_bank[id].gc.dbg_show = npcmgpio_dbg_show;
 		pctrl->gpio_bank[id].direction_input = pctrl->gpio_bank[id].gc.direction_input;
 		pctrl->gpio_bank[id].gc.direction_input = npcmgpio_direction_input;
-- 
2.43.0