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

The "pcmad" driver uses an admin-supplied configuration option
(`it->options[0]`) to configure the I/O port base address of a
PCM-A/D-12 or PCM-A/D-16 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 0x3FC on 4-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/20260130170416.49994-41-abbotti@mev.co.uk
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

authored by

Ian Abbott and committed by
Greg Kroah-Hartman 0ca9f815 ddd5b287

+2 -1
+2 -1
drivers/comedi/drivers/pcmad.c
··· 106 106 struct comedi_subdevice *s; 107 107 int ret; 108 108 109 - ret = comedi_request_region(dev, it->options[0], 0x04); 109 + ret = comedi_check_request_region(dev, it->options[0], 0x04, 110 + 0, 0x3ff, 4); 110 111 if (ret) 111 112 return ret; 112 113