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comedi: aio_aio12_8: Add sanity checks for I/O base address

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The "aio_aio12_8" driver uses an admin-supplied configuration option
(`it->options[0]`) to configure the I/O port base address of a supported
board (AIO12-8, AI12-8, or AO12-4).  It currently allows any base
address to be configured but the hardware only supports base addresses
(set by on-board jumpers) in the range 0x100 to 0x3C0 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@mev.co.uk>
Link: https://patch.msgid.link/20260130170416.49994-5-abbotti@mev.co.uk
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Ian Abbott 2026-01-30 16:47:29 +00:00 committed by Greg Kroah-Hartman
parent a02b67b23e
commit 254ae67d39
1 changed files with 2 additions and 1 deletions
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3
drivers/comedi/drivers/aio_aio12_8.c
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@ -202,7 +202,8 @@ static int aio_aio12_8_attach(struct comedi_device *dev,
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,
0x100, 0x3ff, 32);
if (ret)
return ret;