linux-kernel - Re: [PATCH linux-next v2] lockd: nlmclnt

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Date:	Fri, 15 Feb 2013 11:30:51 -0500
From:	"J. Bruce Fields" <bfields@...ldses.org>
To:	Jeff Layton <jlayton@...hat.com>
Cc:	Tim Gardner <tim.gardner@...onical.com>,
	linux-kernel@...r.kernel.org,
	Trond Myklebust <Trond.Myklebust@...app.com>,
	linux-nfs@...r.kernel.org
Subject: Re: [PATCH linux-next v2] lockd: nlmclnt_reclaim(): avoid stack
 overflow

On Thu, Feb 14, 2013 at 10:20:38AM -0500, Jeff Layton wrote:
> On Wed, 13 Feb 2013 08:40:16 -0700
> Tim Gardner <tim.gardner@...onical.com> wrote:
> 
> > Even though nlmclnt_reclaim() is only one call into the stack frame,
> > 928 bytes on the stack seems like a lot. Recode to dynamically
> > allocate the request structure once from within the reclaimer task,
> > then pass this pointer into nlmclnt_reclaim() for reuse on
> > subsequent calls.
> > 
> > smatch analysis:
> > 
> > fs/lockd/clntproc.c:620 nlmclnt_reclaim() warn: 'reqst' puts
> >  928 bytes on stack
> > 
> > Also remove redundant assignment of 0 after memset.
> > 
> > Cc: Trond Myklebust <Trond.Myklebust@...app.com>
> > Cc: "J. Bruce Fields" <bfields@...ldses.org>
> > Cc: linux-nfs@...r.kernel.org
> > Signed-off-by: Tim Gardner <tim.gardner@...onical.com>
> > ---
> > 
> > Changes from v1 -- don't return -ENOMEM from a task thread because it is
> > not propagated to the task creator. Instead print an error message and return.
...
> Oops, just noticed there was a later version of this patch. Please
> disregard my earlier mail...
> 
> Reviewed-by: Jeff Layton <jlayton@...hat.com>

Thanks, applying.--b.
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