gpio: grgpio: off by one in grgpio_to_irq()

"gc->ngpio" is a number between 1 and GRGPIO_MAX_NGPIO.  If "offset" is
GRGPIO_MAX_NGPIO then we're going one step beyond the end of the
priv->lirqs[] array.

Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Reviewed-by: Alexandre Courbot <acourbot@nvidia.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>

diff --git a/drivers/gpio/gpio-grgpio.c b/drivers/gpio/gpio-grgpio.c
index 09daaf2aeb563d982c71807b8155df4b2c50a6c5..d5bc70fce4df6eb0dd0c1a5e142c8da9482feff0 100644 (file)
--- a/drivers/gpio/gpio-grgpio.c
+++ b/drivers/gpio/gpio-grgpio.c
@@ -121,7 +121,7 @@ static int grgpio_to_irq(struct gpio_chip *gc, unsigned offset)
 {
        struct grgpio_priv *priv = grgpio_gc_to_priv(gc);
 
-       if (offset > gc->ngpio)
+       if (offset >= gc->ngpio)
                return -ENXIO;
 
        if (priv->lirqs[offset].index < 0)