From: Ian Abbott Date: Fri, 30 Jan 2026 16:47:36 +0000 (+0000) Subject: comedi: dac02: Add sanity checks for I/O base address X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=2750aecdf60524a7d58ecdaaa6e9728ad008cadb;p=thirdparty%2Fkernel%2Flinux.git 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 Link: https://patch.msgid.link/20260130170416.49994-12-abbotti@mev.co.uk Signed-off-by: Greg Kroah-Hartman --- 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;