comedi: amplc_pc263: Add sanity checks for I/O base address

The "amplc_pc263" driver uses an admin-supplied configuration option
(`it->options[0]`) to configure the I/O port base address of a supported
PC263 board.  It currently allows any base address to be configured but
the hardware only supports base addresses (set by on-board DIP switches)
in the range 0 to 0x7FE 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/20260130170416.49994-9-abbotti@mev.co.uk
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/comedi/drivers/amplc_pc263.c b/drivers/comedi/drivers/amplc_pc263.c
index d7f088a8a5e38cda266bfda81aeb48ba6d986747..e2196dc9d426516d8034363fe338ca6476fcb2e7 100644 (file)
--- a/drivers/comedi/drivers/amplc_pc263.c
+++ b/drivers/comedi/drivers/amplc_pc263.c
@@ -61,7 +61,8 @@ static int pc263_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,
+                                         0, 0x7ff, 2);
        if (ret)
                return ret;