[PATCH] gpio: grgpio: Add NULL check in grgpio_probe

[Charles Han <hanchunchao@xxxxxxxxxx>]

devm_kasprintf() can return a NULL pointer on failure,but this
returned value in grgpio_probe is not checked.
Add NULL check in grgpio_probe, to handle kernel NULL
pointer dereference error.

Cc: stable@xxxxxxxxxxxxxxx
Fixes: 7eb6ce2f2723 ("gpio: Convert to using %pOF instead of full_name")
Signed-off-by: Charles Han <hanchunchao@xxxxxxxxxx>
Link: https://lore.kernel.org/r/20241114091822.78199-1-hanchunchao@xxxxxxxxxx
Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@xxxxxxxxxx>

diff --git a/drivers/gpio/gpio-grgpio.c b/drivers/gpio/gpio-grgpio.c
index 7ffe59d845f0..169f33c41c59 100644
--- a/drivers/gpio/gpio-grgpio.c
+++ b/drivers/gpio/gpio-grgpio.c
@@ -369,6 +369,9 @@ static int grgpio_probe(struct platform_device *ofdev)
 	gc->owner = THIS_MODULE;
 	gc->to_irq = grgpio_to_irq;
 	gc->label = devm_kasprintf(dev, GFP_KERNEL, "%pOF", np);
+	if (!gc->label)
+		return -ENOMEM;
+
 	gc->base = -1;
 
 	err = of_property_read_u32(np, "nbits", &prop);