diff mbox series

gpio: ep93xx: fix incorrect array element size check

Message ID 20180906115830.19386-1-colin.king@canonical.com
State New
Headers show
Series gpio: ep93xx: fix incorrect array element size check | expand

Commit Message

Colin Ian King Sept. 6, 2018, 11:58 a.m. UTC 
From: Colin Ian King <colin.king@canonical.com>

Currently the while loop checks for the end of the array using
the size of egp->gc rather that the number of elements in the array,
so fix this. Also, perform the array size check first as stylistically
it is always good to bounds check on an array first before referencing
the array (in this case, we're just computing the address of an
element in an array so this is a moot point).

Fixes: fd935fc421e7 ("gpio: ep93xx: Do not pingpong irq numbers")

Signed-off-by: Colin Ian King <colin.king@canonical.com>
---
 drivers/gpio/gpio-ep93xx.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

Comments

Linus Walleij Sept. 6, 2018, 12:44 p.m. UTC | #1 
On Thu, Sep 6, 2018 at 1:58 PM Colin King <colin.king@canonical.com> wrote:

> From: Colin Ian King <colin.king@canonical.com>
>
> Currently the while loop checks for the end of the array using
> the size of egp->gc rather that the number of elements in the array,
> so fix this. Also, perform the array size check first as stylistically
> it is always good to bounds check on an array first before referencing
> the array (in this case, we're just computing the address of an
> element in an array so this is a moot point).
>
> Fixes: fd935fc421e7 ("gpio: ep93xx: Do not pingpong irq numbers")
>
> Signed-off-by: Colin Ian King <colin.king@canonical.com>

Oh that was really neat code! Thanks a lot.

Patch applied.

Yours,
Linus Walleij
diff mbox series

Patch

diff --git a/drivers/gpio/gpio-ep93xx.c b/drivers/gpio/gpio-ep93xx.c
index 68a416fc3141..dd22ea19c3ed 100644
--- a/drivers/gpio/gpio-ep93xx.c
+++ b/drivers/gpio/gpio-ep93xx.c
@@ -76,7 +76,7 @@  static int ep93xx_gpio_port(struct gpio_chip *gc)
 	struct ep93xx_gpio *epg = gpiochip_get_data(gc);
 	int port = 0;
 
-	while (gc != &epg->gc[port] && port < sizeof(epg->gc))
+	while (port < ARRAY_SIZE(epg->gc) && gc != &epg->gc[port])
 		port++;
 
 	/* This should not happen but is there as a last safeguard */