comedi: ni_at_a2150: Add sanity checks for I/O base address

The "ni_at_a2150" driver uses an admin-supplied configuration option
(`it->options[0]`) to configure the I/O port base address of an AT-A2150
series 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 0 to 0x3E0 on 32-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/20260130170416.49994-28-abbotti@mev.co.uk
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/comedi/drivers/ni_at_a2150.c b/drivers/comedi/drivers/ni_at_a2150.c
index e4e5a0ebd195a4df475e8941b81a6d0b8a8358f7..44221c928e327d9219d59919aa797c763ae25dc6 100644 (file)
--- a/drivers/comedi/drivers/ni_at_a2150.c
+++ b/drivers/comedi/drivers/ni_at_a2150.c
@@ -694,7 +694,8 @@ static int a2150_attach(struct comedi_device *dev, struct comedi_devconfig *it)
        if (!devpriv)
                return -ENOMEM;
 
-       ret = comedi_request_region(dev, it->options[0], 0x1c);
+       ret = comedi_check_request_region(dev, it->options[0], 0x1c,
+                                         0, 0x3ff, 32);
        if (ret)
                return ret;