linux-kernel - Re: [PATCH] vsprintf: Prevent NULL dereference using %pNF

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Date:	Tue, 17 Jan 2012 11:43:40 -0800
From:	Joe Perches <joe@...ches.com>
To:	Michał Mirosław <mirq-linux@...e.qmqm.pl>
Cc:	David Miller <davem@...emloft.net>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] vsprintf: Prevent NULL dereference using %pNF

On Tue, 2012-01-17 at 20:39 +0100, Michał Mirosław wrote:
> On Tue, Jan 17, 2012 at 10:51:13AM -0800, Joe Perches wrote:
> > On Tue, 2012-01-17 at 13:46 -0500, David Miller wrote:
> > > From: Joe Perches <joe@...ches.com>
> > > Date: Tue, 17 Jan 2012 10:37:13 -0800
> > > > Passing NULL to %pNF is done in skb_gso_segment
> > > > which could be dereferenced.
> > > skb_gso_segment() should be fixed instead.
> > Maybe.  Dereferencing NULL is bad form.
> > Michał Mirosław should fix that as it's his patch.
> 
> Will do. This is in WARN() and easily fixed.
> 
> > noinline_for_stack should be added anyway.
> 
> Why? There are no local variables there and inlining this function would
> actually save stack space as no stack frame would be created for the call.

Isn't an additional copy of "struct printf_spec spec" on the stack
in function pointer() now?


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