serial: mvebu-uart: Fix to avoid a potential NULL pointer dereference

of_match_device on failure to find a matching device can return a NULL
pointer. The patch checks for such a scenrio and passes the error upstream.

Signed-off-by: Aditya Pakki <pakki001@umn.edu>
Cc: stable <stable@vger.kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/tty/serial/mvebu-uart.c b/drivers/tty/serial/mvebu-uart.c
index 231f751d1ef48b42e4a9820c73408242862035e9..7e7b1559fa3695406ae80edda49f0f1f7634dc9a 100644 (file)
--- a/drivers/tty/serial/mvebu-uart.c
+++ b/drivers/tty/serial/mvebu-uart.c
@@ -810,6 +810,9 @@ static int mvebu_uart_probe(struct platform_device *pdev)
                return -EINVAL;
        }
 
+       if (!match)
+               return -ENODEV;
+
        /* Assume that all UART ports have a DT alias or none has */
        id = of_alias_get_id(pdev->dev.of_node, "serial");
        if (!pdev->dev.of_node || id < 0)