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comedi: rti802: Add sanity checks for I/O base address

The "rti800" driver uses an admin-supplied configuration option
(`it->options[0]`) to configure the I/O port base address of a RTI-802
board. It currently allows any base address to be configured but the
hardware only supports base addresses (configured by on-board DIP
switches) 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/20260130170416.49994-46-abbotti@mev.co.uk
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

authored by

Ian Abbott and committed by
Greg Kroah-Hartman 63c19831 e2b31150

+2 -1
+2 -1
drivers/comedi/drivers/rti802.c
··· 72 72 int i; 73 73 int ret; 74 74 75 - ret = comedi_request_region(dev, it->options[0], 0x04); 75 + ret = comedi_check_request_region(dev, it->options[0], 0x04, 76 + 0, 0x3ff, 4); 76 77 if (ret) 77 78 return ret; 78 79