[PATCH V2 1/2] serial: mctrl_gpio: Check for NULL pointer

[Adam Ford]

When using mctrl_gpio_to_gpiod, it dereferences gpios into a single
requested GPIO.  This dereferencing can break if gpios is NULL,
so this patch adds a NULL check before dereferencing it.  If
gpios is NULL, this function will also return NULL.

Signed-off-by: Adam Ford <aford...@gmail.com>
---
V2:  This patch is new to the V2 of this series, so patch 2/2 can 
     work without risking a NULL dereference
diff --git a/drivers/tty/serial/serial_mctrl_gpio.c 
b/drivers/tty/serial/serial_mctrl_gpio.c
index d9074303c88e..fb4781292d40 100644
--- a/drivers/tty/serial/serial_mctrl_gpio.c
+++ b/drivers/tty/serial/serial_mctrl_gpio.c
@@ -66,6 +66,9 @@ EXPORT_SYMBOL_GPL(mctrl_gpio_set);
 struct gpio_desc *mctrl_gpio_to_gpiod(struct mctrl_gpios *gpios,
                                      enum mctrl_gpio_idx gidx)
 {
+       if (gpios == NULL)
+               return NULL;
+
        return gpios->gpio[gidx];
 }
 EXPORT_SYMBOL_GPL(mctrl_gpio_to_gpiod);
-- 
2.17.1