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Message-ID: <20260130170416.49994-12-abbotti@mev.co.uk> Date: Fri, 30 Jan 2026 16:47:36 +0000 From: Ian Abbott <abbotti@....co.uk> To: linux-kernel@...r.kernel.org Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>, Ian Abbott <abbotti@....co.uk>, H Hartley Sweeten <hsweeten@...ionengravers.com> Subject: [PATCH 11/46] comedi: dac02: Add sanity checks for I/O base address The "dac02" driver uses an admin-supplied configuration option (`it->options[0]`) to configure the I/O port base address of a supported DAC-02 board. It currently allows any base address to be configured but the hardware only supports base addresses (configured by an on-board DIP switch) in the range 0x200 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@....co.uk> --- drivers/comedi/drivers/dac02.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/drivers/comedi/drivers/dac02.c b/drivers/comedi/drivers/dac02.c index 4b011d66d7b0..2c04472c5078 100644 --- a/drivers/comedi/drivers/dac02.c +++ b/drivers/comedi/drivers/dac02.c @@ -103,7 +103,8 @@ static int dac02_attach(struct comedi_device *dev, struct comedi_devconfig *it) struct comedi_subdevice *s; int ret; - ret = comedi_request_region(dev, it->options[0], 0x08); + ret = comedi_check_request_region(dev, it->options[0], 0x08, + 0x200, 0x3ff, 8); if (ret) return ret; -- 2.51.0
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