linux-kernel - [PATCH 42/46] comedi: pcmmio: Add sanity checks for I/O base address

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Message-ID: <20260130170416.49994-43-abbotti@mev.co.uk>
Date: Fri, 30 Jan 2026 16:48:07 +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 42/46] comedi: pcmmio: Add sanity checks for I/O base address

The "pcmmio" driver uses an admin-supplied configuration option
(`it->options[0]`) to configure the I/O port base address of a PCM-MIO
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 0xFFE0 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@....co.uk>
---
 drivers/comedi/drivers/pcmmio.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/comedi/drivers/pcmmio.c b/drivers/comedi/drivers/pcmmio.c
index c2402239d551..d38202c8a12b 100644
--- a/drivers/comedi/drivers/pcmmio.c
+++ b/drivers/comedi/drivers/pcmmio.c
@@ -667,7 +667,8 @@ static int pcmmio_attach(struct comedi_device *dev, struct comedi_devconfig *it)
 	struct comedi_subdevice *s;
 	int ret;
 
-	ret = comedi_request_region(dev, it->options[0], 32);
+	ret = comedi_check_request_region(dev, it->options[0], 32,
+					  0, 0xffff, 32);
 	if (ret)
 		return ret;
 
-- 
2.51.0