From nobody Tue Feb 10 05:44:03 2026 Received: from smtp87.ord1d.emailsrvr.com (smtp87.ord1d.emailsrvr.com [184.106.54.87]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id CE522357A4A for ; Fri, 30 Jan 2026 17:04:51 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=184.106.54.87 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1769792693; cv=none; b=IUTsVee1rXKq/Zeq4NjzIGTfHxj9kyzgDE9/r+/8aQh+4ddCdSq908jFVN5UDNJtSX9Y9BrFTTEAxEdWprKLXlsCytrzVd8HeCxepAmw2ebTu5BpKSuyAGjSCI8rMh7UbX4Qf1Un3IyarXh0wJqUHw25ipO51FEvXFiA93YIQiM= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1769792693; c=relaxed/simple; bh=xH/qXmmDNLQWPdWvIdJXI7UKgvEybpD6VUNCS+BuyTQ=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=aa5LAVT0JSzk0A6DDRU9T2b+orD3CIGMeLs/7uKHN5voLLtsWhlfETf49OkiTc1B8sAjtNGgWMtFqnyrJO2xj7YnHjYuQ3popi1my2PcwRiG2GOAHwuc752aEx63g58jg9ZjCNzKDMk3oK8fb4OF8gKvJP9iBeGFu8VlqThWOeM= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=mev.co.uk; spf=pass smtp.mailfrom=mev.co.uk; dkim=pass (1024-bit key) header.d=mev.co.uk header.i=@mev.co.uk header.b=WKf3qYvK; arc=none smtp.client-ip=184.106.54.87 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=mev.co.uk Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=mev.co.uk Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=mev.co.uk header.i=@mev.co.uk header.b="WKf3qYvK" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=mev.co.uk; s=20221208-6x11dpa4; t=1769792690; bh=xH/qXmmDNLQWPdWvIdJXI7UKgvEybpD6VUNCS+BuyTQ=; h=From:To:Subject:Date:From; b=WKf3qYvKvVSkRWXvljqi4U/z1R9cAJaIZBYwOz0qb27ziByjeAIDy8YMzqAeGYpXh 0DDtVnKYF/AusbIQyAESKwwLp0q2HRE5pP+CqP/CARWRrkNIIqcZOuGMEfKj3tbeV+ EnKQv9E1Jk1LyhTZBHE/xvHgvc/TWrwndJxiK35w= X-Auth-ID: abbotti@mev.co.uk Received: by smtp19.relay.ord1d.emailsrvr.com (Authenticated sender: abbotti-AT-mev.co.uk) with ESMTPSA id C1FC5602F9; Fri, 30 Jan 2026 12:04:49 -0500 (EST) From: Ian Abbott To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , Ian Abbott , H Hartley Sweeten Subject: [PATCH 19/46] comedi: dt2801: Add sanity checks for I/O base address Date: Fri, 30 Jan 2026 16:47:44 +0000 Message-ID: <20260130170416.49994-20-abbotti@mev.co.uk> X-Mailer: git-send-email 2.51.0 In-Reply-To: <20260130170416.49994-1-abbotti@mev.co.uk> References: <20260130170416.49994-1-abbotti@mev.co.uk> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-Classification-ID: 429d5722-7f90-4557-8586-08913fa85e9e-20-1 Content-Type: text/plain; charset="utf-8" The "dt2801" driver uses an admin-supplied configuration option (`it->options[0]`) to configure the I/O port base address of a supported board in the DT2801 family. 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 0x3fe on 2-byte boundaries. Add a sanity check to ensure the device is not configured at an unsupported base address. Signed-off-by: Ian Abbott --- drivers/comedi/drivers/dt2801.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/drivers/comedi/drivers/dt2801.c b/drivers/comedi/drivers/dt280= 1.c index 230d25010f58..d790e69f98a0 100644 --- a/drivers/comedi/drivers/dt2801.c +++ b/drivers/comedi/drivers/dt2801.c @@ -540,7 +540,8 @@ static int dt2801_attach(struct comedi_device *dev, str= uct comedi_devconfig *it) int ret =3D 0; int n_ai_chans; =20 - ret =3D comedi_request_region(dev, it->options[0], 0x2); + ret =3D comedi_check_request_region(dev, it->options[0], 0x2, + 0x200, 0x3ff, 2); if (ret) return ret; =20 --=20 2.51.0