gpio: xgene: Prevent NULL pointer dereference

platform_get_resource() can return NULL, thus add NULL test to prevent NULL
pointer dereference.

Signed-off-by: Axel Lin <axel.lin@ingics.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>

1 files changed, 5 insertions, 0 deletions

diff --git a/drivers/gpio/gpio-xgene.c b/drivers/gpio/gpio-xgene.c
index c0aa387664bf..0dc916191689 100644
--- a/drivers/gpio/gpio-xgene.c
+++ b/drivers/gpio/gpio-xgene.c
@@ -173,6 +173,11 @@ static int xgene_gpio_probe(struct platform_device *pdev)
         }
 
         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+        if (!res) {
+                err = -EINVAL;
+                goto err;
+        }
+
         gpio->base = devm_ioremap_nocache(&pdev->dev, res->start,
                                                         resource_size(res));
         if (!gpio->base) {