linux-kernel - [PATCH 06/46] comedi: amplc_dio200: Add sanity checks for I/O base address

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Message-ID: <20260130170416.49994-7-abbotti@mev.co.uk>
Date: Fri, 30 Jan 2026 16:47:31 +0000
From: Ian Abbott <abbotti@....co.uk>
To: linux-kernel@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Ian Abbott <abbotti@....co.uk>,
	H Hartley Sweeten <hsweeten@...ionengravers.com>
Subject: [PATCH 06/46] comedi: amplc_dio200: Add sanity checks for I/O base address

The "amplc_dio200" driver uses an admin-supplied configuration option
(`it->options[0]`) to configure the I/O port base address of a supported
board (PC212E, PC214E, PC215E, PC218E, or PC272E).  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 0xFE0 on
32-byte boundaries.  (Technically, the DIP switches allow 16-byte
boundaries, but I do not think that is advisable given that the boards
decode a 32-byte address range.)

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

Signed-off-by: Ian Abbott <abbotti@....co.uk>
---
 drivers/comedi/drivers/amplc_dio200.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/comedi/drivers/amplc_dio200.c b/drivers/comedi/drivers/amplc_dio200.c
index 4544bcdd8a70..8b1cbc3d24e5 100644
--- a/drivers/comedi/drivers/amplc_dio200.c
+++ b/drivers/comedi/drivers/amplc_dio200.c
@@ -242,7 +242,8 @@ static int dio200_attach(struct comedi_device *dev, struct comedi_devconfig *it)
 {
 	int ret;

-	ret = comedi_request_region(dev, it->options[0], 0x20);
+	ret = comedi_check_request_region(dev, it->options[0], 0x20,
+					  0, 0xfff, 0x20);
 	if (ret)
 		return ret;

-- 
2.51.0