linux-kernel - Re: [PATCH] vhost: Fix vhost_vq

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Message-ID: <20210317082625.euxknnggg4gv7i5m@steredhat>
Date:   Wed, 17 Mar 2021 09:26:25 +0100
From:   Stefano Garzarella <sgarzare@...hat.com>
To:     Laurent Vivier <lvivier@...hat.com>
Cc:     linux-kernel@...r.kernel.org,
        virtualization@...ts.linux-foundation.org,
        Jason Wang <jasowang@...hat.com>, netdev@...r.kernel.org,
        "Michael S. Tsirkin" <mst@...hat.com>, kvm@...r.kernel.org
Subject: Re: [PATCH] vhost: Fix vhost_vq_reset()

On Fri, Mar 12, 2021 at 03:09:13PM +0100, Laurent Vivier wrote:
>vhost_reset_is_le() is vhost_init_is_le(), and in the case of
>cross-endian legacy, vhost_init_is_le() depends on vq->user_be.
>
>vq->user_be is set by vhost_disable_cross_endian().
>
>But in vhost_vq_reset(), we have:
>
>    vhost_reset_is_le(vq);
>    vhost_disable_cross_endian(vq);
>
>And so user_be is used before being set.
>
>To fix that, reverse the lines order as there is no other dependency
>between them.
>
>Signed-off-by: Laurent Vivier <lvivier@...hat.com>
>---
> drivers/vhost/vhost.c | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)

Reviewed-by: Stefano Garzarella <sgarzare@...hat.com>