[PATCH 5.0 111/146] gpio: exar: add a check for the return value of ida_simple_get fails

[Greg Kroah-Hartman]

5.0-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Kangjie Lu <k...@umn.edu>

commit 7ecced0934e574b528a1ba6c237731e682216a74 upstream.

ida_simple_get may fail and return a negative error number.
The fix checks its return value; if it fails, go to err_destroy.

Cc: <sta...@vger.kernel.org>
Signed-off-by: Kangjie Lu <k...@umn.edu>
Signed-off-by: Bartosz Golaszewski <bgolaszew...@baylibre.com>
Signed-off-by: Greg Kroah-Hartman <gre...@linuxfoundation.org>

---
 drivers/gpio/gpio-exar.c |    2 ++
 1 file changed, 2 insertions(+)

--- a/drivers/gpio/gpio-exar.c
+++ b/drivers/gpio/gpio-exar.c
@@ -148,6 +148,8 @@ static int gpio_exar_probe(struct platfo
        mutex_init(&exar_gpio->lock);
 
        index = ida_simple_get(&ida_index, 0, 0, GFP_KERNEL);
+       if (index < 0)
+               goto err_destroy;
 
        sprintf(exar_gpio->name, "exar_gpio%d", index);
        exar_gpio->gpio_chip.label = exar_gpio->name;