linux-kernel - Re: [PATCH] KEYS: Fix a NULL pointer deref in the user-defined key type

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Message-ID: <20111115225408.GA31763@kroah.com>
Date:	Tue, 15 Nov 2011 14:54:08 -0800
From:	Greg KH <greg@...ah.com>
To:	David Howells <dhowells@...hat.com>
Cc:	torvalds@...ux-foundation.org, akpm@...ux-foundation.org,
	linux-security-module@...r.kernel.org, keyrings@...ux-nfs.org,
	linux-kernel@...r.kernel.org, Jeff Layton <jlayton@...hat.com>,
	Neil Horman <nhorman@...hat.com>,
	Steve Dickson <steved@...hat.com>,
	James Morris <jmorris@...ei.org>
Subject: Re: [PATCH] KEYS: Fix a NULL pointer deref in the user-defined key
 type

On Tue, Nov 15, 2011 at 10:09:45PM +0000, David Howells wrote:
> Fix a NULL pointer deref in the user-defined key type whereby updating a
> negative key into a fully instantiated key will cause an oops to occur when the
> code attempts to free the non-existent old payload.
> 
> This results in an oops that looks something like the following:
> 
> BUG: unable to handle kernel NULL pointer dereference at 0000000000000008
> IP: [<ffffffff81085fa1>] __call_rcu+0x11/0x13e
> PGD 3391d067 PUD 3894a067 PMD 0
> Oops: 0002 [#1] SMP
> CPU 1
> Modules linked in:
> 
> Pid: 4354, comm: keyctl Not tainted 3.1.0-fsdevel+ #1140                  /DG965RY

Ah, so this patch should also go into the 3.1-stable tree?  Any older
ones as welL?

thanks,

greg k-h
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