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comedi: dac02: Add sanity checks for I/O base address

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The "dac02" driver uses an admin-supplied configuration option
(`it->options[0]`) to configure the I/O port base address of a supported
DAC-02 board.  It currently allows any base address to be configured but
the hardware only supports base addresses (configured by an on-board DIP
switch) 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/20260130170416.49994-12-abbotti@mev.co.uk
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Ian Abbott 2026-01-30 16:47:36 +00:00 committed by Greg Kroah-Hartman
parent 118fb051de
commit 2750aecdf6
1 changed files with 2 additions and 1 deletions
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3
drivers/comedi/drivers/dac02.c
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@ -103,7 +103,8 @@ static int dac02_attach(struct comedi_device *dev, struct comedi_devconfig *it)
struct comedi_subdevice *s;
int ret;
ret = comedi_request_region(dev, it->options[0], 0x08);
ret = comedi_check_request_region(dev, it->options[0], 0x08,
0x200, 0x3ff, 8);
if (ret)
return ret;