gpio: GPIO_GET_LINEHANDLE_IOCTL: Validate line offset

[cascardo/linux.git] / drivers / gpio / gpiolib.c

diff --git a/drivers/gpio/gpiolib.c b/drivers/gpio/gpiolib.c
index 7a01969..d287cb4 100644 (file)
--- a/drivers/gpio/gpiolib.c
+++ b/drivers/gpio/gpiolib.c
@@ -444,6 +444,11 @@ static int linehandle_create(struct gpio_device *gdev, void __user *ip)
                u32 lflags = handlereq.flags;
                struct gpio_desc *desc;
 
+               if (offset >= gdev->ngpio) {
+                       ret = -EINVAL;
+                       goto out_free_descs;
+               }
+
                desc = &gdev->descs[offset];
                ret = gpiod_request(desc, lh->label);
                if (ret)