pinctrl: nuvoton: check for devm_kasprintf() failure

devm_kasprintf() may return NULL on failure of internal allocation thus
the assignment to  .label  is not safe if not checked. On error
npcm7xx_gpio_of() returns negative values so -ENOMEM in the
(unlikely) failure case of devm_kasprintf() should be fine here.

Signed-off-by: Nicholas Mc Guire <hofrat@osadl.org>
Fixes: 3b588e43ee5c ("pinctrl: nuvoton: add NPCM7xx pinctrl and GPIO driver")
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>

diff --git a/drivers/pinctrl/nuvoton/pinctrl-npcm7xx.c b/drivers/pinctrl/nuvoton/pinctrl-npcm7xx.c
index b455209..17f909d 100644 (file)
--- a/drivers/pinctrl/nuvoton/pinctrl-npcm7xx.c
+++ b/drivers/pinctrl/nuvoton/pinctrl-npcm7xx.c
@@ -1925,6 +1925,9 @@ static int npcm7xx_gpio_of(struct npcm7xx_pinctrl *pctrl)
                        pctrl->gpio_bank[id].gc.label =
                                devm_kasprintf(pctrl->dev, GFP_KERNEL, "%pOF",
                                               np);
+                       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;