linux-kernel - Re: [PATCH 1/3] xen-gnt: prevent adding duplicate gnt callbacks

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Date:	Thu, 1 Aug 2013 11:12:38 +0100
From:	David Vrabel <david.vrabel@...rix.com>
To:	Roger Pau Monne <roger.pau@...rix.com>
CC:	<xen-devel@...ts.xen.org>, <linux-kernel@...r.kernel.org>,
	Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>
Subject: Re: [PATCH 1/3] xen-gnt: prevent adding duplicate gnt callbacks

On 31/07/13 16:00, Roger Pau Monne wrote:
> With the current implementation, the callback in the tail of the list
> can be added twice, because the check done in
> gnttab_request_free_callback is bogus, callback->next can be NULL if
> it is the last callback in the list. If we add the same callback twice
> we end up with an infinite loop, were callback == callback->next.
> 
> Replace this check with a proper one that iterates over the list to
> see if the callback has already been added.

As a minimal fix suitable for stable,

Reviewed-by: David Vrabel <david.vrabel@...rix.com>

David
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