Hello Geert,
On Tue, Feb 20, 2018 at 10:40:18AM +0100, Geert Uytterhoeven wrote:
> The imx_ports[] array is indexed using a value derived from the
> "serialN" alias in DT, which may lead to an out-of-bounds access.
>
> Fix this by adding a range check.
>
> Fixes: 9206ab8a0350c3da ("serial: imx: Fix out-of-bounds access through DT alias")
huh, this patch fixes itself?
> Signed-off-by: Geert Uytterhoeven <geert+renesas@xxxxxxxxx>
> ---
> drivers/tty/serial/imx.c | 5 +++++
> 1 file changed, 5 insertions(+)
>
> diff --git a/drivers/tty/serial/imx.c b/drivers/tty/serial/imx.c
> index 1d7ca382bc12b238..e89e90ad87d8245c 100644
> --- a/drivers/tty/serial/imx.c
> +++ b/drivers/tty/serial/imx.c
> @@ -2041,6 +2041,11 @@ static int serial_imx_probe(struct platform_device *pdev)
> serial_imx_probe_pdata(sport, pdev);
> else if (ret < 0)
> return ret;
I'd prefer an empty line here.
> + if (sport->port.line >= UART_NR) {
I would have used:
if (sport->port.line >= ARRAY_SIZE(imx_ports))
which IMHO is better understandable
> + dev_err(&pdev->dev, "serial%d out of range\n",
> + sport->port.line);
Note that the same overflow can happen when a device is probed using
platform data (and your commit fixes that, too). Maybe worth to point
out in the commit log?
Other than that: Good catch, thanks for your patch.
Best regards
Uwe
--
Pengutronix e.K. | Uwe Kleine-König |
Industrial Linux Solutions | http://www.pengutronix.de/ |
--
To unsubscribe from this list: send the line "unsubscribe devicetree" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
