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

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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>
This commit is contained in:
Ian Abbott
2026-04-02 15:49:40 +02:00
committed by Greg Kroah-Hartman
parent ddd5b28744
commit 0ca9f8150c
1 changed files with 2 additions and 1 deletions
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drivers/comedi/drivers/pcmad.c
+2 -1
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@@ -106,7 +106,8 @@ static int pcmad_attach(struct comedi_device *dev, struct comedi_devconfig *it)
struct comedi_subdevice *s;
int ret;
ret = comedi_request_region(dev, it->options[0], 0x04);
ret = comedi_check_request_region(dev, it->options[0], 0x04,
0, 0x3ff, 4);
if (ret)
return ret;