linux-kernel - [PATCH 40/46] comedi: pcmad: Add sanity checks for I/O base address

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <20260130170416.49994-41-abbotti@mev.co.uk>
Date: Fri, 30 Jan 2026 16:48:05 +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 40/46] 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 <abbotti@....co.uk>
---
 drivers/comedi/drivers/pcmad.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

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;
 
-- 
2.51.0