From 408bece94e7bdba3b420f1bf4607a2d2dbab1faf Mon Sep 17 00:00:00 2001 From: Ian Abbott Date: Fri, 30 Jan 2026 16:47:45 +0000 Subject: [PATCH] comedi: dt2811: Add sanity checks for I/O base address The "dt2811" driver uses an admin-supplied configuration option (`it->options[0]`) to configure the I/O port base address of a supported board in the DT2811 family. It currently allows any base address to be configured but the hardware only supports base addresses (configured by on-board jumpers) 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/20260130170416.49994-21-abbotti@mev.co.uk Signed-off-by: Greg Kroah-Hartman --- drivers/comedi/drivers/dt2811.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/drivers/comedi/drivers/dt2811.c b/drivers/comedi/drivers/dt2811.c index dbb9f38da2898..bcc4b5ef48e8d 100644 --- a/drivers/comedi/drivers/dt2811.c +++ b/drivers/comedi/drivers/dt2811.c @@ -556,7 +556,8 @@ static int dt2811_attach(struct comedi_device *dev, struct comedi_devconfig *it) if (!devpriv) return -ENOMEM; - ret = comedi_request_region(dev, it->options[0], 0x8); + ret = comedi_check_request_region(dev, it->options[0], 0x8, + 0x200, 0x3ff, 8); if (ret) return ret; -- 2.47.3