The "adq12b" driver uses an admin-supplied configuration option
(`it->options[0]`) to configure the I/O port base address of the ADQ12-B
board.  It currently allows any base address to be configured but the
hardware only supports the following base addresses (set by an on-board
jumper): 0x300, 0x320, 0x340, 0x360, 0x380, 0x3A0.

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>
---
 drivers/comedi/drivers/adq12b.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/comedi/drivers/adq12b.c b/drivers/comedi/drivers/adq12b.c
index 19d765182006..f8fa5c6ecdff 100644
--- a/drivers/comedi/drivers/adq12b.c
+++ b/drivers/comedi/drivers/adq12b.c
@@ -179,7 +179,8 @@ static int adq12b_attach(struct comedi_device *dev, struct comedi_devconfig *it)
 	struct comedi_subdevice *s;
 	int ret;
 
-	ret = comedi_request_region(dev, it->options[0], 0x10);
+	ret = comedi_check_request_region(dev, it->options[0], 0x10,
+					  0x300, 0x3af, 0x20);
 	if (ret)
 		return ret;
 
-- 
2.51.0