From: Ian Abbott Date: Fri, 30 Jan 2026 16:48:05 +0000 (+0000) Subject: comedi: pcmad: Add sanity checks for I/O base address X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=0ca9f8150ce5a41a3b4bb65f043f0335e7ef67b5;p=thirdparty%2Fkernel%2Flinux.git comedi: pcmad: Add sanity checks for I/O base address 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 Link: https://patch.msgid.link/20260130170416.49994-41-abbotti@mev.co.uk Signed-off-by: Greg Kroah-Hartman --- diff --git a/drivers/comedi/drivers/pcmad.c b/drivers/comedi/drivers/pcmad.c index 976eda43881b..fd26b1eed1db 100644 --- a/drivers/comedi/drivers/pcmad.c +++ b/drivers/comedi/drivers/pcmad.c @@ -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;