Hi Dan,
On Sat, 5 Jun 2010 01:19:39 +0200, Dan Carpenter wrote:
> If nextstate == ARRAY_SIZE(lp->btncode), then we read one past the end of
> the array on the next line.
>
> This fixes a smatch warning:
> drivers/input/misc/pcf8574_keypad.c +74 pcf8574_kp_irq_handler(8)
> error: buffer overflow 'lp->btncode' 17 <= 17
>
> Signed-off-by: Dan Carpenter <error27@xxxxxxxxx>
>
> diff --git a/drivers/input/misc/pcf8574_keypad.c b/drivers/input/misc/pcf8574_keypad.c
> index 0ac47d2..4b42ffc 100644
> --- a/drivers/input/misc/pcf8574_keypad.c
> +++ b/drivers/input/misc/pcf8574_keypad.c
> @@ -69,7 +69,7 @@ static irqreturn_t pcf8574_kp_irq_handler(int irq, void *dev_id)
> unsigned char nextstate = read_state(lp);
>
> if (lp->laststate != nextstate) {
> - int key_down = nextstate <= ARRAY_SIZE(lp->btncode);
> + int key_down = nextstate < ARRAY_SIZE(lp->btncode);
> unsigned short keycode = key_down ?
> lp->btncode[nextstate] : lp->btncode[lp->laststate];
>
Good catch.
Acked-by: Jean Delvare <khali@xxxxxxxxxxxx>
--
Jean Delvare
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