[PATCH v3] pinctrl: stm32: check devm_kasprintf() returned value

[Ma Ke]

devm_kasprintf() can return a NULL pointer on failure but this returned
value is not checked. Fix this lack and check the returned value.

Found by code review.

Cc: stable at vger.kernel.org
Fixes: 32c170ff15b0 ("pinctrl: stm32: set default gpio line names using pin names")
Signed-off-by: Ma Ke <make24 at iscas.ac.cn>
---
Changes in v3:
- modified the code style according to suggestions.
Changes in v2:
- modified the patch according to suggestions, added braces;
- modified the typo.
---
 drivers/pinctrl/stm32/pinctrl-stm32.c | 9 +++++++--
 1 file changed, 7 insertions(+), 2 deletions(-)

diff --git a/drivers/pinctrl/stm32/pinctrl-stm32.c b/drivers/pinctrl/stm32/pinctrl-stm32.c
index a8673739871d..5b7fa77c1184 100644
--- a/drivers/pinctrl/stm32/pinctrl-stm32.c
+++ b/drivers/pinctrl/stm32/pinctrl-stm32.c
@@ -1374,10 +1374,15 @@ static int stm32_gpiolib_register_bank(struct stm32_pinctrl *pctl, struct fwnode
 
 	for (i = 0; i < npins; i++) {
 		stm32_pin = stm32_pctrl_get_desc_pin_from_gpio(pctl, bank, i);
-		if (stm32_pin && stm32_pin->pin.name)
+		if (stm32_pin && stm32_pin->pin.name) {
 			names[i] = devm_kasprintf(dev, GFP_KERNEL, "%s", stm32_pin->pin.name);
-		else
+			if (!names[i]) {
+				err = -ENOMEM;
+				goto err_clk;
+			}
+		} else {
 			names[i] = NULL;
+		}
 	}
 
 	bank->gpio_chip.names = (const char * const *)names;
-- 
2.25.1