[PATCH 9/9] serial: xuartps: Fix out-of-bounds access through DT alias

[Geert Uytterhoeven]

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: 1f118c02a1819856 ("serial: xuartps: Fix out-of-bounds access through DT 
alias")
Signed-off-by: Geert Uytterhoeven <geert+rene...@glider.be>
---
 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)
-- 
2.7.4