comedi: dt2814: Add sanity checks for I/O base address

The "dt2814" driver uses an admin-supplied configuration option
(`it->options[0]`) to configure the I/O port base address of a DT2814
board.  It currently allows any base address to be configured but the
hardware only supports base addresses (configured by an on-board DIP
switch) in the range 0x200 to 0x3fe on 2-byte boundaries.

Add a sanity check to ensure the device is not configured at an
unsupported base address.

Signed-off-by: Ian Abbott <abbotti@mev.co.uk>
Link: https://patch.msgid.link/20260130170416.49994-22-abbotti@mev.co.uk
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/comedi/drivers/dt2814.c b/drivers/comedi/drivers/dt2814.c
index c98a5a4a7aecf3e7945a3c32c99eb6277fac4c14..caec16482afba4de50b4695b7283c93f153a9855 100644 (file)
--- a/drivers/comedi/drivers/dt2814.c
+++ b/drivers/comedi/drivers/dt2814.c
@@ -305,7 +305,8 @@ static int dt2814_attach(struct comedi_device *dev, struct comedi_devconfig *it)
        struct comedi_subdevice *s;
        int ret;
 
-       ret = comedi_request_region(dev, it->options[0], 0x2);
+       ret = comedi_check_request_region(dev, it->options[0], 0x2,
+                                         0x200, 0x3ff, 2);
        if (ret)
                return ret;