comedi: dt2817: Add sanity checks for I/O base address

The "dt2817" driver uses an admin-supplied configuration option
(`it->options[0]`) to configure the I/O port base address of a DT2817
board.  It currently allows any base address to be configured but the
hardware only supports base addresses (configured by on-board jumpers)
in the range 0x200 to 0x3f8 on 8-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/20260130170416.49994-24-abbotti@mev.co.uk
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/comedi/drivers/dt2817.c b/drivers/comedi/drivers/dt2817.c
index 6738045c75318ffd7cfdc29d51f838b91c87e07c..9fd5b47c7fa76f7a3c4ed9c892af176b0d0723e7 100644 (file)
--- a/drivers/comedi/drivers/dt2817.c
+++ b/drivers/comedi/drivers/dt2817.c
@@ -103,7 +103,8 @@ static int dt2817_attach(struct comedi_device *dev, struct comedi_devconfig *it)
        int ret;
        struct comedi_subdevice *s;
 
-       ret = comedi_request_region(dev, it->options[0], 0x5);
+       ret = comedi_check_request_region(dev, it->options[0], 0x5,
+                                         0x200, 0x3ff, 8);
        if (ret)
                return ret;