comedi: aio_iiro_16: Add sanity checks for I/O base address

The "aio_iiro_16" driver uses an admin-supplied configuration option
(`it->options[0]`) to configure the I/O port base address of a supported
board (IIRO-16).  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 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/20260130170416.49994-6-abbotti@mev.co.uk
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/comedi/drivers/aio_iiro_16.c b/drivers/comedi/drivers/aio_iiro_16.c
index 739cc4db52ac7e9d030b2e7d7d3d057041b79f54..00d0bb0f6256929eddabcda887682fbe53a5e6cc 100644 (file)
--- a/drivers/comedi/drivers/aio_iiro_16.c
+++ b/drivers/comedi/drivers/aio_iiro_16.c
@@ -167,7 +167,8 @@ static int aio_iiro_16_attach(struct comedi_device *dev,
        struct comedi_subdevice *s;
        int ret;
 
-       ret = comedi_request_region(dev, it->options[0], 0x8);
+       ret = comedi_check_request_region(dev, it->options[0], 0x8,
+                                         0x100, 0x3ff, 0x8);
        if (ret)
                return ret;