On 23.2.2018 14:38, Geert Uytterhoeven wrote:
> The cdns_uart_port[] 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: 928e9263492069ee ("tty: xuartps: Initialize ports according to aliases")
> Signed-off-by: Geert Uytterhoeven <geert+renesas at glider.be>
> ---
> v2:
> - Fix Fixes reference.
> ---
> drivers/tty/serial/xilinx_uartps.c | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/drivers/tty/serial/xilinx_uartps.c b/drivers/tty/serial/xilinx_uartps.c
> index b9b2bc76bcac606c..abcb4d09a2d866d0 100644
> --- a/drivers/tty/serial/xilinx_uartps.c
> +++ b/drivers/tty/serial/xilinx_uartps.c
> @@ -1110,7 +1110,7 @@ static struct uart_port *cdns_uart_get_port(int id)
> struct uart_port *port;
>
> /* Try the given port id if failed use default method */
> - if (cdns_uart_port[id].mapbase != 0) {
> + if (id < CDNS_UART_NR_PORTS && cdns_uart_port[id].mapbase != 0) {
> /* Find the next unused port */
> for (id = 0; id < CDNS_UART_NR_PORTS; id++)
> if (cdns_uart_port[id].mapbase == 0)
>
Reviewed-by: Michal Simek <michal.simek at xilinx.com>
Thanks,
Michal
