linux-kernel - Re: [S390] cio: kernel stack overflow.

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Date:	Wed, 30 Aug 2006 21:19:27 +0200
From:	Heiko Carstens <heiko.carstens@...ibm.com>
To:	David Wagner <daw-usenet@...erner.cs.berkeley.edu>
Cc:	linux-kernel@...r.kernel.org,
	Martin Schwidefsky <schwidefsky@...ibm.com>
Subject: Re: [S390] cio: kernel stack overflow.

On Wed, Aug 30, 2006 at 07:05:54PM +0000, David Wagner wrote:
> Thanks for pointing out that in most cases there was immediately
> preceding code that zeroes out the whole struct using kzalloc() or
> memset(.., 0, ..).  Sorry that I overlooked that; my mistake.  That
> takes care of all but one of these.  But in the interests of caution,
> let me ask about the following one:
> 
> Martin Schwidefsky  wrote:
> >-		cdev->id = (struct ccw_device_id) {
> >-			.cu_type   = cdev->private->senseid.cu_type,
> >-			.cu_model  = cdev->private->senseid.cu_model,
> >-			.dev_type  = cdev->private->senseid.dev_type,
> >-			.dev_model = cdev->private->senseid.dev_model,
> >-		};
> >+		cdev->id.cu_type   = cdev->private->senseid.cu_type;
> >+		cdev->id.cu_model  = cdev->private->senseid.cu_model;
> >+		cdev->id.dev_type  = cdev->private->senseid.dev_type;
> >+		cdev->id.dev_model = cdev->private->senseid.dev_model;
> 
> I don't see any obvious place that zeroes out cdev->id.
> In particular, it looks like cdev->id.match_flags and .driver_info
> are never cleared (i.e., they retain whatever old garbage they had
> before).  More importantly, if anyone ever adds any more fields to
> struct ccw_device_id, then they will also be retain old garbage values,
> which is a maintenance pitfall.  Is this right, or did I miss something
> again?

You're right. Thanks for pointing this out! I will take care of it.
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