linux-kernel - Re: [PATCH] xen/pirq: fix error path cleanup when binding MSIs

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Message-ID: <bede6e55-88d3-3f61-f196-c53212abc66a@suse.com>
Date:   Wed, 28 Feb 2018 20:22:01 +0100
From:   Juergen Gross <jgross@...e.com>
To:     Roger Pau Monne <roger.pau@...rix.com>,
        linux-kernel@...r.kernel.org
Cc:     Boris Ostrovsky <boris.ostrovsky@...cle.com>,
        Amit Shah <aams@...zon.com>, stable@...r.kernel.org,
        xen-devel@...ts.xenproject.org
Subject: Re: [PATCH] xen/pirq: fix error path cleanup when binding MSIs

On 28/02/18 10:19, Roger Pau Monne wrote:
> Current cleanup in the error path of xen_bind_pirq_msi_to_irq is
> wrong. First of all there's an off-by-one in the cleanup loop, which
> can lead to unbinding wrong IRQs.
> 
> Secondly IRQs not bound won't be freed, thus leaking IRQ numbers.
> 
> Note that there's no need to differentiate between bound and unbound
> IRQs when freeing them, __unbind_from_irq will deal with both of them
> correctly.
> 
> Fixes: 4892c9b4ada9f9 ("xen: add support for MSI message groups")
> Reported-by: Hooman Mirhadi <mirhadih@...zon.com>
> Signed-off-by: Roger Pau Monné <roger.pau@...rix.com>

Committed to xen/tip for-linus-4.16a


Juergen